Movie Theater
Human Development
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Script: 从生物学角度看， "人类发育始於受精"， 即一个女人和一个男人 通过生殖细胞的联合， 把各自的23个染色体相结合。 | ||
| 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
