The 2-year-old human brain weighs ______ percent of the adult brain

Tyler's parents divorced when he was 4 1/2 years old. The hardest time for Tyler, in terms of dealing with this divorce, was probably

A) during the subsequent six months. B) about ten years after the divorce. C) when he was about 4. D) the first two to four years after the divorce.

Which of these produces the hormone estrogen?

a. the testicles b. the ovaries c. the adrenal glands d. all of the above