What percent of fathers gain custody of their children after divorce?

Prospective studies of the relationship between drinking problems and anxiety disorders suggest that

a. anxiety disorders lead to heavy drinking. b. heavy drinking increases the probability that an anxiety disorder will later develop. c. anxiety disorders can lead to heavy drinking, and heavy drinking can lead to anxiety disorders. d. the relationship exists for patterns of alcohol abuse but not for alcohol dependence.

Endorphins gave organisms with it an evolutionary advantage because they ________

a. eliminate pain when a painful stimulation is prolonged. b. increase the output of energy during emotion and stress. c. make pain bearable so that it doesn't interfere with actions in an emergency. d. regulate the "biological clock" in the brain.