Movie Theater
Human 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. | ||
| All ages referenced to fertilization, not last menstrual period. |
Amnion and Germ Layers
Early Embryonic Development
Human Development
Heart and Circulatory System
The Folding of the Embryo
The Folding of the Embryo
