The first laboratory of psychology was founded in 1897 in Vienna, Austria

Research on friendships shows that

A) preschoolers interact in essentially the same ways with both friends and nonfriends. B) preschoolers give more reinforcement to nonfriends than to friends. C) most friendships during the preschool years are based on mutual trust. D) the ease with which kindergarteners make new friends predicts behaviors linked to gains in achievement.

The mallard duck is unique in that

A) it does not sleep. B) they can sleep with one hemisphere awake and the other asleep. C) eye movements do not occur during their sleep. D) slow-wave sleep is absent from their sleep pattern. E) these ducks sleep with both eyes wide open.