There are presently states that allow psychologists to prescribe medication for psychological disorders.

During the seventeenth century, when European fur traders arrived, the Iroquois changed from a peace-loving tribe to fierce enemies of their neighbours, the Hurons. This suggests that

A) aggression is affected by innate propensities and learned inhibitory responses. B) economic and social competition can elicit aggression. C) instrumental aggression is inborn. D) aggressive instincts can even vary within a culture. E) evolution selected for aggressive behaviours.

Early in their lives, four out of five American infants have frequent episodes of crying that last for 15 or more minutes ____

a. because of separation anxiety b. for no apparent cause. c. as a function of frustration for lack of parental attention. d. because their environment is not warm enough.