A free-running rhythm is a rhythm without any external

Your 82-year-old grandmother was diagnosed with Alzheimer's disease four years ago. Your mother is very concerned about the potential of being diagnosed with Alzheimer's disease herself

She has been an avid runner for many years and vigorously exercises at least five times a week for 20 to 30 minutes a day. What would you tell your mother? a. Exercise surely will help, but there is no evidence that it does. b. Do not worry too much, exercise has been shown to decrease the likelihood of Alzheimer's disease. c. For any benefit to accrue from exercise, she will also need to closely monitor her diet. d. Very strenuous exercise actually increases the likelihood of experiencing Alzheimer's disease.

Seven-year-old Matthew has begun playing with dolls. Considering what is known about the causes of gender identity disorder in childhood, his parents should

a) seek professional help for Matthew. b) quietly remove the dolls and begin encouraging more appropriate activities. c) begin setting stricter limits on Matthew's behaviour generally. d) do nothing.