A) morula
B) gastrula
C) blastula
D) blastomere
Correct Answer: A
Solution :
The embryo at the 16-celled stage is called the morula. It is the mass of cells resulting from the cleavage of the ovum before the formation of a blastula. Blastomere is any cells produced during cleavage. Blastula is the early developmental stage of a metazoan. following the morula stage and consisting of a single, spherical layer of cells that encloses a hollow, central cavity.
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