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Umbilical cord suspends embryo in amniot...

Umbilical cord suspends embryo in amniotic cavity and is attached to the midgut region of the embryo.In eutherians, this umbilical cord is formed of the stalk of

A

Yolk sac and amnion

B

Allatois and chorion

C

Yolk sac and chorion

D

Allantois and yold sac

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