An embryo rests in a sac called the placenta, which is filled with amniotic fluid that cushions the embryo and maintains a constant temperature.

Name: An embryo rests in a sac called the placenta, which is filled with amniotic fluid that cushions the embryo and maintains a constant temperature.
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The embryo actually rests in the amniotic sac, which is filled with amniotic fluid. The placenta is an organ that attaches to the lining of the womb and provides oxygen and nutrients to the growing baby.

An Embryo Rests in a Sac Called the Placenta, Which