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17 March, 04:24

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

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  1. 17 March, 05:39
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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.
  2. 17 March, 07:26
    0
    between the mother's and fetus blood through the placenta and cord
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