________ refers to the formation of new neurons within the brain

Bolin is a teacher who finds his job very stimulating. Irwin, his childhood buddy, has never found his vocational niche and stocks grocery store shelves for a living. As these friends move into middle age, what is MOST likely to happen?

a) Both men will become more mentally flexible. b) Predictions are impossible. c) Bolin should become more mentally flexible; Irwin will cognitively decline. d) Both men will decline cognitively.

How prevalent is bulimia across cultures? a. It is most common in cultures with a low standard of living

b. It is most common in cultures where women have few or no rights. c. It has been reported only in cultures with a strong Western influence. d. It is about equally common in all known cultures.