A theorist proposed that anorexia was caused by early child sexual abuse. Dr. Firestorm demonstrated that her anorexic patient had never been sexually abused. This is an example of one important use of which method?

___________ may develop when a person is repeatedly exposed to negative events over which he/she has no control.

A. frustration. B. conflict. C. burnout. D. learned helplessness.

Evolutionary change is gradual. However, the genetic influence of the lactase enzyme has shown that

A) culture and genetic adaptations have influenced one another. B) lactose intolerance is not genetic nor cultural. C) Europeans tend to be most lactose intolerant. D) Asians have included increasing amounts of milk in their diet.