Umbilical cord contains

Options :
  1. umblicus
  2. placenta
  3. discus proligerus
  4. allantoic artery and vein
Answer and Explanation :-

Answer: Option 4

Explanation:

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Pieces. A bit for someone here. A bit there. And sometimes they don't add up to anything whole. But you are so busy dancing. Delivering. You don't have time to notice. Or are afraid to notice. And then one day you have to look. And it's true. All of your pieces fill up other people's holes. But they don't fill your own.
-Mary E. Pearson The Adoration of Jenna Fox