Which of the following is the biggest predictor of dangerousness?

Billy shows high levels of aggression on the playground, and his mother has attempted to determine the cause of his aggression. She has noted several facts about Billy that she thinks could be contributing to these aggressive displays. Which one of the following demonstrates a hormonal cause for his aggression?

A) Billy's father was also very aggressive. B) Billy's doctor found that Billy has exceptionally high levels of testosterone. C) Billy's friends are also very aggressive boys. D) Billy's mother consumed a great deal of alcohol when she was pregnant with Billy. E) Billy watches a lot of violent cartoons.

How can scientists study the living brain since it is protected by the skull? The textbook notes several methods for this type of study. Describe the different approaches that have been used to explore the workings of the brain

What will be an ideal response?