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Home Q & A Board Science-Related Homework Help Psychology Developmental Psychology
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8 years ago
The __________ is a fluid-filled sac that cushions the embryo and maintains a constant temperature.
a.   placenta   c.   germ disc
b.   umbilical cord   d.   amniotic sac
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Children and Their Development

Children and Their Development


Edition: 3rd
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8 years ago
You're such a godsend, thank you.
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8 years ago
You're welcome.

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