Darwin proposed the theory of sexual selection to explain th..

第1题

Early in the sixteenth century, Francis Bacon proposed that science consisted in the eleva

tion of the authority of experiment and observation over that of reason, intuition, and convention. Bacon thought that as more and more reliable and precise particular facts accumulate, they can be classified and generalized, resulting in an ever-expanding hierarchy of useful "axioms". This is what he meant by "induction".

Although many people today continue to regard the collection of facts and their arrangement by induction into theories as the heart of scientific method, Bacon's conception of what facts and theories are and of the relationship between them was hopelessly unrealistic even in his own time. The most important early scientific discoveries---such as those made by Galileo about the movement of the earth, by Keppler about the elliptical shape of planetary orbits, and later by Newton about the "force" of gravity--could never have been made if Bacon's rules had prevailed.

Determined to avoid all premature speculations, Bacon proposed that data gathering be carried out by illiterate assistants with no interest in whether an experiment turned out one way or another. Plain facts, properly arranged, would automatically lead to certain knowledge of the universe. Nothing could be more misrepresentative of the actual problem-solving techniques of the scientific method. That plain facts do not speak for themselves is evident from Bacon's own acceptance of the errors contained in what appeared to be the most "obvious'' of facts. For Bacon, that the earth did not move was a fact because it could be seen not to move; and for Bacon it was a fact that life was being spontaneously generated because maggots always developed in putrid flesh and frogs appeared after every rain.

What is clear is that the great breakthroughs of Newton, Darwin, or Marx could never have been achieved solely on the basis of Baconian fact gathering. Facts are always unreliable without theories which guide their collection and which distinguish between superficial and significant appearances.

According to Bacon, facts______.

A．are determined by observations

B．can only be understood through logical reasoning

C．have a hierarchy

D．are gathered by illiterate assistants

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第2题

The theory of evolution by natural selection was put forward in the 1850s independently by

two men. One was Charles Darwin; the other was Alfred Russel Wallace. Both men had some scientific background, of course, but at heart both men were naturalists. Darwin had been a medical student at Edinburgh University for two years, before his father who was a wealthy doctor proposed that he might become a clergyman and sent him to Cambridge.

Wallace, whose parents were poor and who had left school at 14, had followed courses at Working Men's Institutes in London and Leicester as a surveyor's apprentice and pupil teacher.

The fact is that there are two traditions of explanation that march side by side in the ascent of man. One is the analysis of the physical structure of the world. The other is the study of the processes of life: their delicacy, their diversity, the wavering cycles from life to death in the individual and in the species. And these traditions do not come together until the theory of evolution; because until then there is a paradox which cannot be resolved, which cannot be begun, about life.

The paradox of the life sciences, which makes them different in kind from physical science, is in the detail of nature everywhere. We see it about us in the birds, the trees, the grass, the snails, in every living thing. It is this, the manifestations of life, its expressions, its forms, are so diverse that they must contain a large element of the accidental. And yet the nature of life is so uniform. that it must be constrained by many necessities.

So it is not surprising that biology as we understand it begins with naturalists in the 18th and 19th centuries: observers of the countryside, bird-watchers, clergymen, doctors, gentlemen of leisure in country houses. I am tempted to call them, simply, "gentlemen in Victorian England", because it cannot be an accident that the theory of evolution is conceived twice by two men living at the same time in the same culture — the culture of Queen Victoria in England.

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第3题

SECTION 2Optional Translation（30 points)The theory of evolution by natural selection was p

SECTION 2 Optional Translation (30 points)

The theory of evolution by natural selection was put forward in the 1850s independently by two men. One was Charles Darwin; the other was Alfred Russel Wallace. Both men had some scientific background, of course, but at heart both men were naturalists. Darwin had been a medical student at Edinburgh University for two years, before his father who was a wealthy doctor proposed that he might become a clergyman and sent him to Cambridge. Wallace, whose parents were poor and who had left school at 14, had followed courses at Working Men's Institutes in London and Leicester as a surveyor's apprentice and pupil teacher.

The fact is that there are two traditions of explanation that march side by side in the ascent of man. One is the analysis of the physical structure of the world. The other is the study of the processes of life: their delicacy, their diversity, the wavering cycles from life to death in the individual and in the species. And these traditions do not come together until the theory of evolution; because until then there is a paradox which cannot be resolved, which cannot be begun, about life.

The paradox of the life sciences, which makes them different in kind from physical science, is in the detail of nature everywhere. We see it about us in the birds, the trees, the grass, the snails, in every living thing. It is this, the manifestations of life, its expressions, its forms, are so diverse that they must contain a large element of the accidental. And yet the nature of life is so uniform. that it must be constrained by many necessities.

So it is not surprising that biology as we understand it begins with naturalists in the 18th and 19th centuries: observers of the countryside, bird-watchers, clergymen, doctors, gentlemen of leisure in country houses. I am tempted to call them, simply, "gentlemen in Victorian England ", because it cannot be an accident that the theory of evolution is conceived twice by two men living at the same time in the same culture—the culture of Queen Victoria in England.

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第4题

Darwin proposed the theory of sexual selection to explain the origin of ostentatious pluma

Darwin proposed the theory of sexual selection to explain the origin of

ostentatious plumage in certain bird species, maintaining that the ornate

features of males are a consequence of female mate selection based on an

abstract aesthetic sense, not unlike the process of animal breeders producing

(5) fancy-male varieties of pigeons by conscious artificial selection. Wallace

suggested an alternative explanation: through greater physical energy the most

highly adorned males are able to win the competition with rival males.

Meanwhile Huxley pointed out that male adornment is instrumental in

establishing dominance relationships among males: adornment reduces the

(10) physical activity necessary to intimidate rivals.

However, Jacobs later examined the process of female choice, concluding

that what appeared to be choice of an adorned male by a female was really a

mutual attraction to a certain reproductive site. Mate selection requires an

awareness of features characteristic of a suitable breeding site, which might be

(15) mirrored in the ornamentation of the male, and thus mate selection is related

directly to adaptive niche specialization. From this insight, Austin proceeded to

develop a food-courtship theory of mate selection: the population most efficient

in use of the energy available in a particular niche will be the fittest to survive

there. Through natural selection, organisms will tend to become specialized to

(20) form. isolated populations, each adapted to utilize the energy most efficiently

that is available in a particular niche and this process of segregation and

specialization of populations is facilitated by employing in the mating process

samples of the food available in the preferred niche. In particular cases, the

male may display the food to the female or feed it to her in the courtship

(25) ceremony, maybe bearing permanent representations of specific foods on his

plumage, and the female may be attracted to the male for these representations

of the territorial foods.

Austin's theory may be applied to the case for mate choice among

peafowls, whose males' "eyespotted" tail feathers bear a striking resemblance

(30) to blue berries. According to the food-courtship theory, it is because their

plumage bears representations of food that peacocks attract peahens, which may

explain why males with the most "eyespots" on their tail have the greatest

mating success. Not inconsistent with a possible role of the "eyespots" in

reproductive competition among males and in aesthetic selection, this

(35) explanation seems more plausible than the suggestion that by selecting mates

according to the perfection of their tail-feather "eyespots", peahens are able to

identify mates with the greatest "fitness". This process, bringing together

males and females of similar tastes and physiologies, may lead to speciation.

Some of the male display features may come to be involved in species

(40) identification, and it has also been noted that male adornment could have a dual

function, repelling rival males as well as attracting females.

The passage is primarily concerned with

A．contrasting the role of domination and courtship in determining the evolution of bird plumage

B．illustrating the effectiveness of a particular approach to categorizing various evolutionary innovations

C．documenting the origins of a currently accepted scientific theory about food and courtship

D．proposing a new explanation for the evolutionary reasons behind the ornamentation of male bird plumage

E．showing that physical adaptation plays an integral role in contributing to species identification of birds

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第5题

For hundreds of years, farmers have selected and bred plants and animals to favor, or brin

g out, characteristics they desired. For example, cows that produced large amounts of milk were selected for breeding, while poor milk producers were not allowed to reproduce. In like manner, horses were bred for speed and strength. Those having these desired characteristics were selected for breeding. Over time, these preferred breeds became more common than earlier, less desired types. This selective breeding is called artificial selection.

In this passage, Camp and Arms explain how this same process occurs naturally. The theory of evolution by natural selection was put forward in a joint presentation of the views of Charles Darwin and Alfred Russell Wallace before the Linnaean Society of London in 1858. Darwin and Wallace were not the first to suggest that evolution occurred; but their names are linked with the idea of evolution because they proposed the theory of natural se- lection as the mechanism by which evolution occurs. We are always more likely to believe in a process when people explain how it happens than if they merely assert that it does.

The theory of evolution by means of natural selection is based on three observations. First, as we can see by comparing one cat or human being with another, the members of a species differ from one another; that is, there is variation among individuals of the same species. Second, some (though not all) of the differences between individuals are inherited. (Other differences are not inherited, but are caused by different environments. For in- stance, two plants with identical genes may grow to different sizes if one of them is planted in poor soil. ) Third, more organisms are born than live to grow up and reproduced many organisms die as embryos or seeds, as saplings, nestlings, or larvae.

Inherited characteristics that improve an organism's chances of living and reproducing will be more common in the next generation and those that decrease its chances of reproducing will be less common. Various genes or combinations of genes will be naturally selected for or against, from one generation to the next, depending on how they affect reproductive potential. For natural selection to cause a change in a population from one generation to the next (that is, to cause evolution), it is not necessary that all genes affect survival and reproduction; the same result occurs if just some genes make an individual more likely to grow up and reproduce.

The main difference between natural and artificial selection is that human beings______.

A．control the direction of artificial selection

B．control the direction of natural selection

C．make new genes in artificial selection

D．make new genes in natural selection

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第6题

For hundreds of years, farmers have selected and bred plants and animals to favour, or bri

ng out, characteristics they desired.. For example, cows that produced large amounts of milk were selected for breeding, while poor milk producers were not allowed to reproduce. Similarly, horses were bred for speed and strength. Those having these desired characteristics were selected for breeding. Over time, these preferred breeds became more common than earlier, less desired types. This selective breeding is called artificial selection.

The theory of evolution by natural selection was put forward in a joint presentation of the views of Charles Darwin and Alfred Russell Wallace before the Linnaean Society of London in 1858. Darwin and Wallace were not the first to suggest that evolution occurred, but their names are linked with the idea of evolution because they proposed the theory of natural selection as the mechanism by Which evolution occurs. We are always more likely to believe in a process when people explain how it happens than if they merely assert that it does.

The theory of evolution by means of natural selection is based on three observations. First, as we can see by comparing one cat or human being with another, the members of a species differ from one another; that is, there is variation among individuals of the same species. Second, some of the differences between individuals are inherited. (Other differences are not inherited, but are caused by different environments. For instance, two plants with identical genes may grow to different sizes if one of them is planted in poor soil.) Third, more organisms are born than live to grow up and reproduce: many organisms die as embryos or seeds, as saplings, nestlings, or larvae.

The logical conclusion from these three observations is that certain genetic characteristics of an organism will increase its chances of living to grow up and reproduce over the chances of organisms with other characteristics. To take an extreme example, if you have inherited a severe genetic disease of the liver, you have a much lower chance of living to grow up and reproduce than someone born without this disease.

Inherited characteristics that improve an organism's chances of living and reproducing will be more common in the next generation and those that decrease its chances of reproducing will be less common. Various genes or combinations of genes will be naturally selected from one generation to the next (that is, to cause evolution). It is not necessary that all genes affect survival and reproduction; the same result occurs if just some genes make an individual more likely to grow up and reproduce.

To summarize:

1. Individuals in a population vary in each generation.

2. Some of these variations are genetic.

3. More individuals are produced than live to grow up and reproduce.

4. Individuals with some genes are more likely to survive and reproduce than those with other genes.

Conclusion: From the above four premises it follows that those genetic traits that make their owners more likely to grow up and reproduce will become increasingly common in the population from one generation to the next.

The main difference between natural and artificial selection is that human beings______.

A．control the direction of artificial selection

B．control the direction of natural selection

C．make new genes in artificial selection

D．make new genes in natural selection

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第7题

This section measures your ability to understand academic passages in English. The Re

ading section of TOEFL iBT is divided into 2 or 3 separately timed parts. Most questions in the Reading section are worth 1 point, but the last question for each passage is worth more than 1 point. The directions for the last question include the point value of the question. Some passages will include a word or phrase that is underlined. You can see its definition or an explanation in the Glossary box. Within each part in the real test, you can go on to the next question by clicking the Next icon. You may skip questions and go back to them later. If you want to go back to previous questions, click the Back icon. You may click the Review icon at any time and the review screen will show you which questions you have answered and which you have not. From the review screen, you can go directly to any question you have already seen in the Reading section. You will now begin the Reading section. There is 1 passage for this part of the section, and you will have 20 minutes to read the passage and answer the questions. Natural Selection First coined by Darwin, the term natural selection refers to the process at the core of evolutionary theory. Simply put, Darwin believed that every living organism had to struggle to survive and reproduce. By random chance, some individuals in a species would have characteristics that made them better adapted to this struggle than their contemporaries. Such individuals would be more likely to reproduce and pass their characteristics on to their offspring. Over many generations, a series of small differences in characteristics would accumulate, until eventually the creatures that were produced would be so different from their original ancestors that they would constitute a new species. (A) Although Darwin did not know how variations between individual members of the same species were able to arise in the first place or how such traits could then be passed on from species to species, we now know that this process occurs through genes. (B) Genes determine what characteristics an organism will possess, from its size to its skin color to its gender. (C) Sometimes these genes become damaged or altered--a process known as mutation. (D) Most mutations are either too small to have any effect, or have detrimental effects on the organism. A few, however, can be beneficial to helping an organism survive. The organisms with these beneficial mutations are the ones that .survive and reproduce, passing their particular genetic mutation on to future generations. Originally, Darwin thought that two particular types of traits were naturally selected for evolution. The first type included any and all traits that helped an organism survive, either by giving it easier access to food, better protection from predators, or superior adaptability to shifting environmental conditions. Several examples of the natural selection of such traits have been observed since Darwin first proposed his theory. The most often cited example is the coloration of moths near industrial centers. Some of them have white wings and the others have black wings. Under normal conditions, the lighter-colored moths predominate since white moths are less visible against the light-colored bark of the trees in the forests where they live, which means they can more easily avoid predators. Near industrial centers, however, darker-colored moths predominate, as the pollution from the factory has darkened the bark of the nearby trees. Moths landing on these trees are much more difficult to see if they have black wings. This trait has now become most common in moth populations living in areas where pollutants have changed the color of the tree bark. The second type of naturally selected traits envisioned by Darwin involved those characteristics of an organism that made it easier for that organism to find a mate. This form. of natural selection, often called sexual selection, was thought to explain the existence of highly developed traits in certain animals that seemed to play no particular role in their survival, and that in some cases seemed to make it even harder for them to survive. A prime example of such a trait is the peacocks elaborate, colorful tail feathers. A long, unwieldy tail that can expand into a display of bright colors that draws the attention of any predator in the vicinity seems less likely than that of other kinds of birds to help the bird survive. However, researchers discovered that peahens invariably chose to mate with those peacocks whose tail feathers produced the most artistic displays. Thus, although the peacocks tail feathers have no adaptive function in terms of coping with survival pressure, the gene that controls feather color is the one that is most likely to be passed on because of its role in the mating process. Many scientists now believe that a third type of naturally selected characteristics exists, namely those that may be harmful to an individual organism but beneficial to that organisms species. This helps to explain the persistence of certain traits that were viewed under traditional evolutionary theory as not assisting in adaptation. For instance, in many animal species, including humans, a small subset of the population is homosexual. Under the old view of evolution, this could not be accounted for since homosexual individuals do not normally reproduce, meaning the gene that codes for it should have long been phased out of the gene pool. However, recent studies among wild sheep populations have found that the prevalence of homosexuality in the sheep population increases in times of severe food shortages, causing the sheep to form. stronger bonds with sheep of the same sex than they otherwise would. As a result, instead of fighting over a particular food source, these sheep share the food they find with each other, increasing the species chance of surviving hard times. Though still controversial, the idea that traits may be naturally selected because of their benefits to the species instead of their benefits to the individual is rapidly gaining acceptance in the scientific community because of the wide array of characteristics that it can explain, including the human tendency towards altruism

The word "them" in the passage refers to

A．characteristics.

B．individuals.

C．species.

D．contemporaries.

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第8题

Part B （10 points) Coinciding with the groundbreaking theory of biological evolution propo

Part B (10 points)

Coinciding with the groundbreaking theory of biological evolution proposed by British naturalist Charles Darwin in the 1860s, British social philosopher Herbert Spencer put forward his own theory of biological and cultural evolution. Spencer argued that all worldly phenomena, including human societies, changed over time, advancing toward perfection. (41) ______

American social scientist Lewis Henry Morgan introduced another theory of cultural evolution in the late 1800s. Morgan helped found modern anthropology—the scientific study of human societies, customs and beliefs—thus becoming one of the earliest anthropologists. In his work, he attempted to show how all aspects of culture changed together in the evolution of societies. (42) ______

In the early 1900s in North America, German-born American anthropologist Franz Boas developed a new theory of culture known as historical particularism. Historical particularism, which emphasized the uniqueness of all cultures, gave new direction to anthropology. (43) ______

Boas felt that the culture of any society must be understood as the result of a unique history and not as one of many cultures belonging to a broader evolutionary stage or type of culture. (44) ______

Historical particularism became a dominant approach to the study of culture in American anthropology, largely through the influence of many students of Boas. But a number of anthropologists in the early 1900s also rejected the particularist theory of culture in favor of diffusionism. Some attributed virtually every important cultural achievement to the inventions of a few, especially gifted peoples that, according to diffusionists, then spread to other cultures. (45) ______

Also in the early 1900s, French sociologist Emile Durkheim developed a theory of culture that would greatly influence anthropology. Durkheim proposed that religious beliefs functioned to reinforce social solidarity. An interest in the relationship between the function of society and culture became a major theme in European, and especially British, anthropology.

A. Other anthropologists believed that cultural innovations, such as inventions, had a single origin and passed from society to society. This theory was known as diffusionism.

B. In order to study particular cultures as completely as possible, he became skilled in linguistics, the study of languages, and in physical anthropology, the study of human biology and anatomy.

C. He argued that human evolution was characterized by a struggle he called the "survival of the fittest," in which weaker races and societies must eventually be replaced by stronger, more advanced races and societies,

D. They also focused on important rituals that appeared to preserve a people's social structure, such as initiation ceremonies that formally signify children's entrance into adulthood.

E. Thus, in his view, diverse aspects of culture, such as the structure of families, forms of marriage, categories of kinship, ownership of property, forms of government, technology, and systems of food production, all changed as societies evolved.

F. Supporters of the theory viewed culture as a collection of integrated parts that work together to keep a society functioning.

G. For example, British anthropologists Grafton Elliot Smith and W. J. Perry incorrectly suggested, on the basis of inadequate information, that farming, pottery making, and metallurgy all originated in ancient Egypt and diffused throughout the world. In fact, all of these cultural developments occurred separately at different times in many parts of the world.

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第9题

根据下列文章，回答41～45题。 Directions:In the following text, some sentences hav

根据下列文章，回答41～45题。

Directions:

In the following text, some sentences have been removed. For Questions (41～45), choose the most suitable one from the list AG to fit into each of the numbered blank. There are two extra choices, which do not fit in any of the gaps. Mark your answers on ANSWER SHEET 1. (10 points)

Coinciding with the groundbreaking theory of biological evolution proposed by British naturalist Charles Darwin in the 1860s, British social philosopher Herbert Spencer put forward his own theory of biological and cultural evolution. Spencer argued that all worldly phenomena, including human societies, changed over time, advancing toward perfection. ______（41）______ .

American social scientist Lewis Henry Morgan introduced another theory of cultural evolution in the late 1800s. Morgan, along with Tylor, was one of the founders of modern anthropology. In his work, he attempted to show how all aspects of culture changed together in the evolution of societies.______（42）______ .

In the early 1900s in North America, Germanborn American anthropologist Franz Boas developed a new theory of culture known as historical particularism. Historical particularism, which emphasized the uniqueness of all cultures, gave new direction to anthropology._____（43）______.

Boas felt that the culture of any society must be understood as the result of a unique history and not as one of many cultures belonging to a broader evolutionary stage or type of culture. ______（44）______.

Historical particularism became a dominant approach to the study of culture in American anthropology, largely through the influence of many students of Boas. But a number of anthropologists in the early 1900s also rejected the particularist theory of culture in favor of diffusionism. Some attributed virtually every important cultural achievement to the inventions of a few, especially gifted peoples that, according to diffusionists, then spread to other cultures.______（45）______.

Also in the early 1900s, French sociologist Emile Durkheim developed a theory of culture that would greatly influence anthropology. Durkheim proposed that religious beliefs functioned to reinforce social solidarity. An interest in the relationship between the function of society and culture—known as functionalism—became a major theme in European, and especially British, anthropology.

A．Other anthropologists believed that cultural innovations, such as inventions, had a single origin and passed from society to society. This theory was known as diffusionism.

B．In order to study particular cultures as completely as possible, Boas became skilled in linguistics, the study of languages, and in physical anthropology, the study of human biology and anatomy.

C．He argued that human evolution was characterized by a struggle he called the “survival of the fittest,” in which weaker races and societies must eventually be replaced by stronger, more advanced races and societies.

D．They also focused on important rituals that appeared to preserve a people’s social structure, such as initiation ceremonies that formally signify children’s entrance into adulthood.

E．Thus, in his view, diverse aspects of culture, such as the structure of families, forms of marriage, categories of kinship, ownership of property, forms of government, technology, and systems of food production, all changed as societies evolved.

F．Supporters of the theory viewed as a collection of integrated parts that work together to keep a society functioning.

G．For example, British anthropologists Grafton Elliot Smith and W. J. Perry incorrectly suggested, on the basis of inadequate information, that farming, pottery making, and metallurgy all originated in ancient Egypt and diffused throughout the world. In fact, all of these cultural developments occurred se

请选择(41)处最佳答案（）。{Page}

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第10题

Part B Directions: Directions: In the following text, some sentences have been removed.

Part B

Directions:

Directions: In the following text, some sentences have been removed. For Questions (41-45), choose the most suitable one from the list A-G to fit into each of the numbered blank. There are two extra choices, which do not fit in any of the gaps. Mark your answers on ANSWER SHEET 1. (10 points)

Coinciding with the groundbreaking theory of biological evolution proposed by British naturalist Charles Darwin in the 1860s, British social philosopher Herbert Spencer put forward his own theory of biological and cultural evolution. Spencer argued that all worldly phenomena, including human societies, changed over time, advancing toward perfection. 41.____________.

American social scientist Lewis Henry Morgan introduced another theory of cultural evolution in the late 1800s. Morgan, along with Tylor, was one of the founders of modern anthropology. In his work, he attempted to show how all aspects of culture changed together in the evolution of societies.42._____________.

In the early 1900s in North America, German-born American anthropologist Franz Boas developed a new theory of culture known as historical particularism. Historical particularism, which emphasized the uniqueness of all cultures, gave new direction to anthropology. 43._____________ .

Boas felt that the culture of any society must be understood as the result of a unique history and not as one of many cultures belonging to a broader evolutionary stage or type of culture. 44._______________.

Historical particularism became a dominant approach to the study of culture in American anthropology, largely through the influence of many students of Boas. But a number of anthropologists in the early 1900s also rejected the particularist theory of culture in favor of diffusionism. Some attributed virtually every important cultural achievement to the inventions of a few, especially gifted peoples that, according to diffusionists, then spread to other cultures. 45.________________.

Also in the early 1900s, French sociologist émile Durkheim developed a theory of culture that would greatly influence anthropology. Durkheim proposed that religious beliefs functioned to reinforce social solidarity. An interest in the relationship between the function of society and culture—known as functionalism—became a major theme in European, and especially British, anthropology.

41._________

[A] Other anthropologists believed that cultural innovations, such as inventions, had a single origin and passed from society to society. This theory was known as diffusionism.

[B] In order to study particular cultures as completely as possible, Boas became skilled in linguistics, the study of languages, and in physical anthropology, the study of human biology and anatomy.

[C] He argued that human evolution was characterized by a struggle he called the “survival of the fittest,” in which weaker races and societies must eventually be replaced by stronger, more advanced races and societies.

[D] They also focused on important rituals that appeared to preserve a people’s social structure, such as initiation ceremonies that formally signify children’s entrance into adulthood.

[E] Thus, in his view, diverse aspects of culture, such as the structure of families, forms of marriage, categories of kinship, ownership of property, forms of government, technology, and systems of food production, all changed as societies evolved.

[F]Supporters of the theory viewed as a collection of integrated parts that work together to keep a society functioning.

[G] For example, British anthropologists Grafton Elliot Smith and W. J. Perry incorrectly suggested, on the basis of inadequate information, that farming, pottery making, and metallurgy all originated in ancient Egypt and diffused throughout the world. In fact, all of these cultural developments occurred separately at different times in many parts of the world.

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