Q:

A portion of the secondary yolk sac of the human:

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A portion of the secondary yolk sac of the human:


  1. contains large amounts of intracellularly stored yolk material used for nourishment of the embryo
  2. give rise to much of the embryonic blood
  3. both A and B
  4. neither A nor B

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B. give rise to much of the embryonic blood

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