Pregnancy begins with the implantation of:

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(D) The process of pregnancy begins with the implantation of the $Blastocyst$ into the uterine wall (endometrium).After fertilization,the zygote under

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Blastocyst

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(D) The process of pregnancy begins with the implantation of the $Blastocyst$ into the uterine wall (endometrium).After fertilization,the zygote undergoes cleavage to form a morula and subsequently develops into a $Blastocyst$.The $Blastocyst$ consists of an outer layer of cells called the trophoblast and an inner cell mass.Implantation typically occurs about $6$ to $7$ days after fertilization.

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