The allantois
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.
Correct Answer:
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Q21: The outer ring of cells of the
Q26: The process of gastrulation ends with the
Q31: Which is the last stage in pre-embryonic
Q32: The amnion
A)is the first site of blood
Q33: During the third week of development,which two
Q35: The pre-embryonic structure created by cleavage is
Q37: Gestation
A)is the time from fertilization to embryo
Q37: From which primary germ layer does the
Q42: During the third and fourth months,
A)lanugo covers
Q44: The first system to be visually evident
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