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How is the yolk sac formed? What is the function of the yolk sac?
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Answer / Munnakumar
The yolk sac forms from a portion of the embryo that is rich in yolk. In animals with a large yolk, such as birds and reptiles, the yolk sac provides nutrients to the developing embryo. In mammals, the yolk sac plays a role in the development of the circulatory system.
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Micro Biology 
