Which of the following animals has never been shown to use objects as tools?

Obedience and respect for authority are values that _____ parents are especially likely to stress to their children

A) middle class B) nontraditional C) working class D) professional

Which of the following statements about friendships in middle adulthood is true?

A) Mid-life friendships are just as intimate and close as those in the earlier years. B) The frequency of interaction among best friends tends to increase. C) Middle-aged people maintain a relatively large social network. D) Middle-aged mothers maintain more friendships than their young adult daughters.