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22 June, 13:33

What allows substances to pass back and forth between the placenta and the embryo?

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  1. 22 June, 16:11
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    between the mother's and fetus blood through the placenta and cord
  2. 22 June, 17:07
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    Answer: the fetus.

    Explanation: The fetus is connected to the placenta by a tube called the umbilical cord. The cord contains two arteries and a vein. Substances pass back and forth between the mother's and fetus's blood through the placenta and cord.
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