Which of the following has been suggested as a cause or trigger for insomnia?

What type of genes previously functioned normally but now produce abnormal cell duplication?

a. stability genes b. oncogenes c. tumor suppressor genes d. cancer genes

Critics of the biological explanations for increased androgyny at midlife point out that

A) a rise in "masculine" traits in women when children depart from the home does not always occur. B) women become more sensitive after children depart from the home, in order to enrich the marital relationship. C) hormone levels in both genders tend to remain stable across the lifespan. D) both men and women actually become more masculine with age.