How is the yolk sac formed? What is the function of the yolk sac?
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The yolk sac is the membrane sac attached to an embryo, formed by a cell of the hypoblast adjacent to the embryonic disk.
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The yolk sac is a extra embryonic membranous structure found in embryo. Yolk sac is formed by vittelus . Yolk sac provides nutrition to the embryo.
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