Multiple Choice
Blood flow in the placenta
A) freely travels between mother and embryo as part of one circulatory system.
B) is blocked, keeping the embryo isolated from the mother's body.
C) is a potential cause of miscarriage.
D) allows certain substances to pass through the placenta, even though mother and embryo's circulatory systems do not mix.
Correct Answer:
Verified
Correct Answer:
Verified
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