Which of the following is true for cleavage?

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(B) Cleavage is a series of rapid mitotic divisions of the zygote,which converts the single-celled zygote into a multicellular structure called a moru

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The size of the cells decreases.

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(B) Cleavage is a series of rapid mitotic divisions of the zygote,which converts the single-celled zygote into a multicellular structure called a morula.During cleavage,the total volume of the embryo remains constant because there is no growth phase ($G_1$ or $G_2$) between divisions.As the number of cells increases,the size of each individual cell (blastomere) decreases because the cytoplasm is partitioned into smaller units without an increase in total cytoplasmic mass.

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