As the larva stage that goes from the BLASTULA cells divide is moving inward and seen the embryo as a Cup, which looks similar to the wall with 2 layers of outer and inner layer is now and will see two gaps and the BLASTOCOEL is the ARCHENTERON which continue to develop as the ARCHENTERON tract. Subsequent to birth tissues inserted between the outer tissue and the tissue layer tissue in this emerging middle class in tissue is the end stage GASTRULA is created the nervous system up.
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