Research indicates that total time spent in REM sleep is especially high in

Which is common among today's U.S. emerging adults?

a) getting married in the early twenties b) staying in the nest to avoid work c) leaving the nest around age 25 d) moving in and out of the nest

A child who has not mastered object permanence believes that

a. not all grown-up men are fathers. b. two small pieces of pizza are better than one large piece. c. everyone is thinking about the child. d. a hidden doll no longer exists. e. rain occurs when the clouds are sad.