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This is the lining of the uterus that protects and surrounds the fetus1 umbilical cord2 placenta3 cellular wall4 veins

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User Sigman
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Unit 5: Lesson 10:

13. B. Placenta.

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User Phil Jollans
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The answer would be 2 placenta. A thin walled sac that surrounds the fetus during pregnancy. The sac is filled with amniotic fluid(liquid made by fetus) and the amnion(the membrane that covers the fetal side of the placenta)
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User Piotrga
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