Movie TheaterHuman Development |
| Buy NowFrom The Biology of Prenatal Development. |
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Script: Biologically speaking, "human development begins at fertilization," when a woman and a man each combine 23 of their own chromosomes through the union of their reproductive cells. |
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All ages referenced to fertilization, not last menstrual period.
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Human Development
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Heart and Circulatory System
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The Folding of the Embryo
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The Folding of the Embryo
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Heart Development
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The Embryo and Yolk Sac
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