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The ______ becomes the placenta. a. yolk sac b. chorion c. amnion d. allantois
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The ______ becomes the placenta. a. yolk sac b. chorion c. amnion d. allantois

User Kadrian
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I think the correct answer would be A. The yolk sac becomes the placenta. It is membranous sac that is attached to the embryo. It provides all the nutrition and the blood cells needed by the embryo. It is also called the umbilical vesicle.
User Ambiguousmouse
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