Which of the following events does not occur during the period of the zygote?

Question

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The period of the zygote is the first two weeks of pregnancy, during which rapid cell division and differentiation of cells occur. However, the development of body structures and internal organs does not occur until later in embryonic development. Implantation also occurs during the period of the zygote, as the blastocyst attaches to the lining of the uterus.

Which of the Following Events Does Not Occur During the Period