Sound waves are simply ___________
a) the vibration of the molecules of the air surrounding us
b) the impact of acoustrons in the air
c) a form of electronic radiation
d) the result of emitted photons from a source
ANS: A
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Which of the following statements about physical growth in middle childhood is true?
a. Vision changes are uncommon. b. Children run longer and faster because of expanded lung capacity. c. Growth continues at the same rate as in infancy. d. fThe proportion of body fat is identical for girls and boys.
Mark is experiencing a great deal of stress at home, at work, and in his daily life. He is having financial trouble, car trouble, and cannot afford to take time off of work to get his car fixed. His friend Greg provides social support by ________
a) reminding Mark of the wide array of things he should be doing in addition to his long list. b) taking Mark's car in to the shop for him. c) staying out of the way so that Mark has plenty of alone time to sort through his situation. d) making sure everyone knows of Mark's shortcomings.