The amnion
A) is the first site of blood cell formation.
B) is the fetal half of the placenta.
C) becomes the umbilical cord vessels.
D) cushions and protects the embryo with fluiD.
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Q26: The process of gastrulation ends with the
Q27: From which primary germ layer does the
Q28: From which primary germ layer do both
Q29: What important event does NOT occur in
Q31: Which is the last stage in pre-embryonic
Q33: During the third week of development,which two
Q36: The allantois
A)is the first site of blood
Q37: Gestation
A)is the time from fertilization to embryo
Q37: From which primary germ layer does the
Q39: Embryonic development
A)refers to the first week.
B)refers to
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