What occurs during cleavage and gastrulation, along with how the morula and blastula relate to cleavage?

During cleavage, the cells divide without an increase in mass; that is, one large single-celled zygote divides into multiple smaller cells.

Explanation:

i think it's the first one because doctors aren't the ones who get rid of the old needles. most of them time it's not even doctors who give you shots, it's nurses.

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