Answer:
Behavior
Step-by-step 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.