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A researcher (Eibl-Eibesfeldt, 1963) raised rats in isolation. When other rats were finally introduced into their cages, rats raised alone __________, suggesting that __________.a. could not defend themselves; aggression is learnedb. used the same aggressive behaviors as other rats; aggression need not be learnedc. did not aggress against them; instrumental aggression does not exist in nonhumansd. fled from the new rats; aggression must be learned

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