Q:

The first indication of gastrulation in the embryo is

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The first indication of gastrulation in the embryo is


  1. formation of the primitive streak
  2. formation of the notochord
  3. formation of the neural tube
  4. formation of extraembryonic mesoderm
  5. formation of tertiary chorionic villi

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A. The formation of the primitive streak on the dorsal surface of the bilaminar embryonic disk is the first indication of gastrulation.

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