The highest rates of chronic disease occur among people who are at the lowest income and education levels

. John and Kim are in the same grade at school. They have met each other once at camp, but really don't know each other that well. Which of the following is the most accurate description of their relationship? John and Kim are

a. friends. b. peers. c. clique-mates. d. dweebs.

Underactivity of which endocrine gland or brain structure causes inactivity, sleepiness, slowness, obesity, and depression?

a. thyroid gland b. thymus c. pineal gland d. hippocampus