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,remarkable findings have been made in ethology,the study of animal social behavior. earlier scientists had 1 that nonhuman social life was almost totally instinctive or fixed by genetics. much more careful observation has shown that 2 variation occurs among the social ties of most species,showing that learning is a part of social life. that is,the 3 are not solely fixed by the genes.
4,the learning that occurs is often at an early age in a process that is called imprinting. imprinting is clearly 5 instinctive,but it is not quite like the learning of humans;it is something in between the two. an illustration best 6 the nature of imprinting. once,biologists thought that ducklings followed the mother duck because of instincts. now we know that,shortly 7 they hatch,ducklings fix 8 any objec考研英语模拟试题及答案