But even though the reproductive system is essential to keeping a species alive, unlike other ... The zygote goes through a process of becoming an embryo and developing into a fetus. ... These genes come from the male's sperm and the female's egg. ... When a woman isn't pregnant
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But even though the reproductive system is essential to keeping a species alive, unlike other ... The zygote goes through a process of becoming an embryo and developing into a fetus. ... These genes come from the male's sperm and the female's egg. ... When a woman isn't pregnant