yes and no... u can learn aggression from your parents if they are but if u had a rough childhood u can be aggressive because of anger issues and trust issues.
It is a threatening behavior that one animal uses to gain control over another. Aggression between members of the same species hardly ever results in the injury or death of any of the...
1. The act of initiating hostilities or invasion. 2. The practice or habit of launching attacks. 3. Hostile or destructive behavior or actions. Source: Answers.com