Blood vessels of the umbilical cord are formed by.......

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

Answer: Option 2

Explanation:

Allantois forms the blood vessels of the umbilical cord. The function of the allantois is to collect liquid waste from the embryo, as well as to exchange gases used by the embryo.

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