The the outermost layer of the embryo.

Options :
  1. Chorion
  2. Allantois
  3. Amnion
  4. Yolk sac
Answer and Explanation :-

Answer: Option 1


Chorion is the outermost layer of the embryo. It is formed by extraembryonic mesoderm and the two layers of trophoblast and surrounds the embryo and other membranes. The chorionic villi emerge from the chorion, invade the endometrium, and allow transfer of nutrients from maternal blood to fetal blood.

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