Answer to Question 1
b
Answer to Question 2
Organizing effects produce long-lasting structural effects. During a sensitive period in early development, the first trimester of pregnancy for humans, sex hormones determine whether the body develops female or male genitals. They lead to more receptors, and therefore greater sensitivity, around the female nipples than the male nipples. Later researchers recognized that sex hormones produce additional organizing effects at puberty. The surge of hormones at puberty produces breast development in women, facial hair and penis growth in men, changes in voice, and malefemale differences in the anatomy of certain parts of the hypothalamus. Some of the differences in brain anatomy between males and females increase during this time. The changes developing at puberty persist throughout life, even after the concentration of sex hormones declines.
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