1 - Major studies have indicated that there may be a causal link between televised violence and aggressive behavior by viewers.

2 - Bullying is a form of aggressive behavior in which someone intentionally and repeatedly causes another person injury or discomfort.

3 - Many birds that form flocks compete through aggressive interaction (mutual or reciprocal action or influence) for priority of access to resources such as food and shelter.

4 - Theories about the causes of aggression cover a broad spectrum, ranging from those with biological or instinctive emphases to those that portray aggression as a learned behavior.

5 - In the past, it was believed that cancer associated with pregnancy was more aggressive and that the outcome for all patients was dismal.