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morula vs. blastula

[ mawr-oo-luh, -yoo- ]
noun,
  1. the mass of cells resulting from the cleavage of the ovum before the formation of a blastula.
[ blas-chuh-luh ]
noun,
  1. the early developmental stage of an animal, following the morula stage and consisting of a single, spherical layer of cells enclosing a hollow, central cavity.

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