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A major reason for conflict in the animal world is territory. The male animal【C1】______ an
When there is【C7】______ over territory, animals will commonly use force, or a【C8】______ of force, to decide which will stay and which will go. It is interesting to note,【C9】______ ,that animals seem to use only the【C10】______ amount of force necessary to drive away the intruder. There is usually no killing. In the【C11】______ of those animals which are capable of doing each other harm, there is a【C12】______ for the losing animal to show the winning animal that he wishes to submit. When he shows this, the【C13】______ normally stops fighting. Animals (especially birds),which can【C14】______ escape from conflict seem to have no【C15】______ against killing, and equally no mechanism for【C16】______ The losing bird simply flies away. However, if two doves are 【C17】______ in a cage, and they start fighting, they will continue to fight until one kills the other. We all think of the dove as a【C18】______ of peace and,【C19】______ its natural habitat, it is peaceful. But the "peace" mechanism does not【C20】______ in a cage.
【C1】
A.establishes
B.builds
C.founds
D.erects