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 learned
b. used the same aggressive behaviors as other rats; aggression need not be learned
c. did not aggress against them; instrumental aggression does not exist in nonhumans
d. fled from the new rats; aggression must be learned
Answer: B
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Fill in the blank(s) with correct word
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