A growing body of research suggests that there is little developmental difference between children whose parents are gay and lesbian and those who have heterosexual parents

Withdrawal from one of these substances can be lethal. Which is it?

a. Hallucinogens b. Caffeine c. Cocaine d. Nicotine

Theories postulating that sleep permits the body to recover from internal deficits produced by wakefulness are often referred to as

A) adaptation theories. B) recuperation theories. C) free-running theories. D) circadian theories. E) diurnal theories.