Bianca's infant daughter reacts negatively to new places and new people, but successfully adjusts after some time. According to research conducted by Thomas and Chess, this baby most likely has which of the following types of temperaments?

According to the facial feedback hypothesis, when Noah complies with instructions to smile and look happy, it is most likely that

A) he will begin to feel annoyed. B) he will begin to feel angry. C) his positive feelings will increase. D) his reaction will depend on his age.

Charlie is 18 years old. If he and his 18-year-old friends are typical, about what percentage of them have smoked a cigarette in the past month?

a. 5% b. 15% c. 32% d. 50%