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Auditore Auditore
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6 years ago
The ________ is a fluid-filled sac that cushions the embryo and maintains a constant temperature.
A) placenta
B) umbilical cord
C) germ disc
D) amnion
Textbook 
Children: A Chronological Approach, Canadian Edition

Children: A Chronological Approach, Canadian Edition


Edition: 5th
Authors:
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EzioEzio
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6 years ago
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Auditore Author
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6 years ago
Smart ... Thanks!
rhockeygirl
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Yesterday
this is exactly what I needed
shimyshiguy
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2 hours ago
Good timing, thanks!
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