From which primary germ layer does the epithelial lining of the digestive system and the blood vessels develop?
A) ectoderm
B) endoderm
C) mesoderm
D) None of these choices are correct for both systems.
Correct Answer:
Verified
Q21: The outer ring of cells of the
Q26: The process of gastrulation ends with the
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
Q36: The allantois
A)is the first site of blood
Q37: Gestation
A)is the time from fertilization to embryo
Q42: During the third and fourth months,
A)lanugo covers
Q44: The first system to be visually evident
Q45: During the fourth and fifth weeks
A)all organ
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