The female gonads produce female gametes eggs ; the male gonads produce male gametes sperm. The baby's head usually comes first; the umbilical cord teen vagina review out with the baby and is cut after the baby is delivered. These genes come from the father's sperm and the mother's egg, which are produced by the male and female reproductive systems.

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This ability to become wider or narrower allows the vagina to accommodate something as slim as a tampon and as wide as a baby. When a baby girl is born, her ovaries contain hundreds of thousands of eggs, which remain inactive until puberty begins. A very thin piece of skin-like tissue called the hymen partly covers the opening of the vagina.

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During the fetal stage, which lasts from 9 weeks after fertilization to birth, development continues as cells multiply, move, and change. GAH-meetz , are involved. Sexual reproduction couldn't happen without the sexual organs called the gonads.

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If a female and male have sex within several days of the female's ovulation egg release , fertilization can occur. Within each tube is a tiny passageway no wider than a sewing needle.

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When a baby girl is born, her ovaries contain hundreds of thousands of eggs, which remain inactive until puberty begins. Humans, like other organisms, pass certain characteristics of themselves to the next generation through their genes , the special carriers of human traits.