Brain imaging produced by structural scans, such as CT and MRI scans, have demonstrated brain atrophy, beginning for most people after age ________

A recent study reported that Americorps volunteers were higher than a comparison group on the following:

a. understanding community problems. b. engagement in civic activities. c. overall life satisfaction. d. all of these answers are correct.

If an infant does not respond to its own name by __________ months, parents should begin to be concerned about a possible hearing impairment

a. 1 or 2 c. 8 or 9 b. 4 or 5 d. 12