According to the text, what percent of people over age 75 are probably affected by at least one chronic condition?

The process of neurogenesis occurs when:

a. neurons convert themselves to stem cells. b. neurons divide to create two new neurons. c. immature stem cells give birth to new neurons. d. neurons convert themselves to glial cells.

Personality researchers use

A) self-report measures. B) projective tests. C) behavioral measures. D) all of the above