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What is yolk sac? How is it formed?
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Answer / Ashwani Kumar Joshi
The yolk sac is a membranous structure found in the early stages of embryo development, which plays an essential role in the nourishment of the embryo. It is formed by the invagination of the inner cell mass into the blastocyst cavity during implantation. The yolk sac contains nutrients like proteins, sugars, lipids, and minerals that are crucial for the growth and development of the embryo.
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Micro Biology 
