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THE REPRODUCTION SYSTEMS

THE REPRODUCTION SYSTEMS

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embryonic disc. Other cells begin to form support structures. The . yolk sac, on one side of the disc, will become part of the digestive tract. On the other side, the . amnion. fills with fluid and will surround the embryo as it develops. Other cell groups initiate the placenta and umbilical cord, which will bring in nutrients and eliminate waste.

  Embryonic

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