The extra-embryonic membrane that forms blood cells is the
A) yolk sac.
B) amnion.
C) allantois.
D) chorion.
Correct Answer:
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Q18: Each of the following statements concerning development
Q19: Fertilization is complete when which of the
Q21: By day 12 of embryonic development,mesoderm begins
Q22: The oval,three-layered sheet produced by gastrulation is
Q23: The endoderm forms
A) muscle.
B) blood.
C) neural tissue.
D)
Q25: During implantation,the
A)syncytial trophoblast erodes a path through
Q25: Identify what process is occurring at the
Q27: Endoderm + mesoderm = which extra-embryonic membrane(s)?
A)chorion
B)amnion
C)allantois
D)yolk
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