The chorionic villi A) form from branches of the syncytiotrophoblast cords. B) increase surface area of the amniotic cavity. C) contribute to the…

The chorionic villi

A) form from branches of the syncytiotrophoblast cords.

B) increase surface area of the amniotic cavity.

C) contribute to the formation of the placenta.

D) are necessary for implantation to occur.

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