Phycology uses different perspectives that together allow for one understanding of something. Among such levels of analysis are, a biological, cognitive, evolutionary and social-cultural approach. Together, all perspectives achieve a biopsychological approach. In this case, the subject being aggression, all, provide different explanation as to what aggression is.
A biological approach might credit the aggression to hereditary factors. Meaning, if your ancestors had a tendency to constantly be angry, then that is the reason for your aggression, the passing of genes. (Heredity) Some people are born with more temperament. Different parts of the brain are acting when someone is acting aggressively
Instead, a cognitive level of analysis, might say that the reason for aggression is because of a certain interpretation of events that lead to anger. (Acting aggressively affects one’s thinking)
To the contrary, an evolutionary perspective tributes aggression to the fact that anger might have better allowed us to survive and reproduce, and therefore it is a trait we have developed. It is from generation from generation that the traits are passed
A social-cultural approach might explain the reason for aggression being that the society and environment we live in has shaped that aggression, perhaps by making it “acceptable”. What is seen as aggression in one culture is not seen as aggressive in another. A specific situation might affect aggressive thinking and behavior.