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:
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Q29: Which of the following is NOT a
Q30: The yolk sac
A)is the first site of
Q31: Identical twins involve _ egg(s)and _ sperm.
A)two;two
B)one;one
C)two;one
D)one;two
Q32: A typical pregnancy test detects the presence
Q33: What important event does NOT occur in
Q35: The pre-embryonic structure created by cleavage is
Q36: From which primary germ layer do both
Q37: Gestation
A)is the time from fertilization to embryo
Q38: The fetus is surrounded by a protective
Q39: Embryonic development
A)refers to the first week.
B)refers to
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