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After the morula stage what is the next stage? What is the morphological feature that defines that stage?

Answer:

After passing the morula stage in which the embryo was a compact mass of cells, the next stage is the blastula stage. In the blastula stage, the compactness is lost and an internal cavity filled with fluid appears inside, the blastocele.

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After the blastula stage what is the following stage of the embryonic development? How is the passage from blastula to the next stage called?	What are the cells produced in the first stage of the embryonic development called?