An influential ethologist was __________.

Adaptation-level theory suggests that

a. our present satisfaction depends on the level of success to which we are accustomed. b. the more money we have, the less we need to feel happy. c. we will make upward comparisons more than we make downward comparisons. d. high-impact events will have long-lasting effects on happiness levels.

According to your text, the reason that aphrodisiacs can be effective is because: a. They improve blood flow to the genitals

b. They make the user "high" thus eliminating sexual inhibitions. c. The user believes they will work. d. They mimic natural arousal processes within the male and female body.