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Ethology is a branch of zoology concerned with the study of animal behavior. Ethologists take a comparative approach, studying behaviors ranging from kinship, cooperation, and parental investment, to conflict, sexual selection, and aggression across a variety of species.

Answer:

Behavior

Explanation:

Ethology is a branch of zoology in which zoologist study about the animal behaviour. Ethologists  adopt a comparative method to study the varied form of animal behaviour ranging from -  Sexual selection, aggression, co-operation between two organism, kinship etc.  

Researchers study about both the classical behavior patterns (FAPs – Fixed action patterns) as well as the adaptive changes in behavior brought in by the evolution.