The yolk sac is the embryonic membrane that forms the first ____________________.
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Q125: The average human gestation period is _
Q126: The umbilical vein carries blood from the
Q127: During gestation, the last 32 weeks are
Q128: During gestation, the first 8 weeks are
Q129: In the embryo, the liver and lungs
Q131: In the embryo, the epidermis and nervous
Q132: The chorion is the embryonic membrane that
Q133: The embryonic membrane that forms the first
Q134: The embryonic membrane that forms the fetal
Q135: The umbilical arteries carry blood from the
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