Which neurotransmitter may cause neurons to become overexcited, and thus may cause damage if its level is excessive?

According to her mom, 33-year-old Shara had no problems during childhood

. Shara is now a school teacher and has a child of her own. During her adolescent years, however, Shara "ran with a crowd" that smoked pot, shoplifted, and occasionally vandalized buildings. During her youth, Shara's behavior could best be described as a. suburban diaspora. b. adolescent-limited delinquency. c. life-course-persistent delinquency. d. adolescent egocentrism.

What percentage of people in their 60s are afflicted with losses in cognitive functioning severe enough to interfere with daily life?

a. 1–2% b. 4–5% c. 7–8% d. 10–12%