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Alex dope Alex dope
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6 years ago
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.
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kadu31kadu31
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6 years ago
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Alex dope Author
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6 years ago
This calls for a celebration Person Raising Both Hands in Celebration
Alina01978
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Yesterday
Thanks for your help!!
halyna
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2 hours ago
Brilliant ツ
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