Some designer drugs produce what dangerous side effects?

A growing number of researchers regard the question of how much heredity and environment contribute to differences among people as

A) unanswerable. B) mainly answered by DNA. C) unimportant. D) easily answered with kinship studies.

Animal studies indicate that the effect of serotonin on aggression may reflect a more general effect of serotonin on

A) cognitive function. B) risky behaviors. C) threat behavior. D) maternal behavior. E) learning and memory.