Multiple Choice
The protective environment inside the mother's uterus is called the ______, and nutrients and waste materials are exchanged between the mother and embryo via the ______.
A) amniotic sac; placenta
B) placenta; amniotic sac
C) placenta; neural tube
D) umbilical cord; placenta
E) amniotic sac; neural tube
Correct Answer:

Verified
Correct Answer:
Verified
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