Once cleavage starts, the zygote starts dividing, forming cells that are

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The cells formed during cleavage are called blastomeres. The term "morula" refers to a stage a little later on when the zygote has divided into a solid ball of cells. "Blastocyte" is not a correct term, and "differentiated" refers to cells that have already undergone specialization into specific cell types. "Blastocysts" are similar but refer to a later stage where a fluid-filled cavity has formed within the ball of cells.

Once Cleavage Starts, the Zygote Starts Dividing, Forming Cells That