The........is the innermost layer of the embryo.

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

Answer: Option 3

Explanation:

The amnion is the innermost layer of the embryo. It is developed in reptiles, birds, and mammals, which are hence called "Amniota"; but not in amphibians and fish which are termed as "Anamniota". The primary role of this membrane is the protection of the embryo for its development.

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