The yolk sac is an important food supply for the growing fetus.

Name: The yolk sac is an important food supply for the growing fetus.
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The yolk sac provides early nourishment in the form of transferred nutrients during the first few weeks of development, but it is not a direct food supply for the growing fetus; the placenta takes over this role by providing nutrients and oxygen through the mother's bloodstream.

The Yolk Sac Is an Important Food Supply for the Growing