Prenatal development of female reproductive structures. If the fetus has ovaries, then no testosterone is produced. In the absence of testosterone and the presence of estrogen and progesterone from the mother, regions of the fetus develop into female reproductive structures. Estrogen and progesterone are steroid hormones. Development of secondary sexual characteristics. Secretion of estrogen and progesterone by the ovaries increases at puberty.This causes: Enlargement of breasts. Pubic and underarm hair growth. Widening of the hips.

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