Sleep apnea is a sleep disorder involving sudden and unpredictable daytime attacks of sleepiness or lapses into REM paralysis

What term refers to helping behavior that is performed voluntarily for the benefit of another person, with no anticipation of reward?

a) altruism b) collectivism c) interdependence d) humanitarianism

Which of the following would NOT be typical of play during middle childhood?

A) Building a treehouse B) Doing flips on a trampoline C) Throwing a football D) Pretending to be a dentist