Neurons send messages to one another by releasing chemicals called

All of the following are true of anorexia nervosa EXCEPT that

a. the individual weighs less than 85 percent of his or her expected weight. b. there is an intense fear of becoming fat. c. it may, in very serious instances, lead to death. d. its occurrence is equally likely in men and women.

Most studies of heritability of human intelligence are based on what type of evidence?

a. Twins and adopted children b. Comparisons among cultures c. Changes from one generation to the next d. The correlation between IQ scores and brain volume