Michelle's blood test reveals that her level of LDL (low-density lipoprotein) is very high and that it makes the LDL stick to the sides of the blood vessels, thus causing the arteries to harden. In this scenario, Michelle is most likely to suffer from a condition known as

The most significant environmental cue that plays a role in circadian rhythms is __________

a) loud noise. b) extreme heat. c) hunger. d) bright light.

Juan enjoys dating Martha because she is very popular and is the captain of the cheerleading squad. He feels that by dating her, he gains the respect of his peer group. What function does dating serve him?

a. status b. mate selection c. socialization d. recreation