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Conception is when the sperm and egg unite after sexual intercourse. Conceptiion happens on day one of prenatal devolpment.
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period of zygote After a female egg is fertalized,the esulting one-celled organism becomes known as a zygote.
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embryo The first two weeks after conception are known as the germinal stage,the third through the eighth week embryotic period.
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Birth is what happens after the baby has been growing in the womb for about 9 months.
