The sac that surrounds the fetus and usually ruptures just before childbirth is the
A) gastrula.
B) allantois.
C) yolk sac.
D) amnion.
E) archenteron.
Correct Answer:
Verified
Q30: In fetal circulation, which structure allows blood
Q31: Genes that determine how segments develop during
Q32: During pregnancy, maternal and fetal blood mix
Q33: A homeotic gene codes for a(n) _
Q34: Which association is mismatched?
A) chorion-gas exchange
B) amnion-blood
Q36: In experiments with the roundworm Caenorhabditis elegans,
Q37: The sex of the fetus can be
Q38: The human blastocyst
A) gives rise to umbilical
Q39: Which statement is true about homeotic genes?
A)
Q40: Which of the following determines the relationship
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