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Human placenta is chorioallantoic because

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Chorion forms blood vessels for placenta

Amnion forms blood vessels for placenta

both chorion and allontois forms blood vessels and placenta

Allantois forms blood vessels for placenta

answer is C.

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Detailed Solution

Eutherian mammals have chorioallantoic placenta. It is classified as chorioallantoic due to the cho- rion (trophoblast plus fetal mesoderm) is vascularized by vessels derived from the mesoderm of the allantoic stalk.

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