Which of the following structures connects the placenta and allows materials to be carried to and from the developing organism?
A) teratogen
B) neural tube
C) amniotic fluid
D) umbilical cord
Correct Answer:
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Q32: The neural tube, which forms the brain
Q33: The spongy tissue that grows out of
Q35: The umbilical cord contains
A) two veins and
Q36: By _ the eyes begin to form,
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Q38: The first reflexes to appear are usually
Q39: During weeks _, the first arm and
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