In human females,the blastocyst:

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(D) The correct answer is $(d)$.Implantation in the endometrial uterine wall takes place at the blastocyst stage of embryonic development.Before impla

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gets implanted in the endometrium by the trophoblast cells.

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(D) The correct answer is $(d)$.Implantation in the endometrial uterine wall takes place at the blastocyst stage of embryonic development.Before implantation,the blastomeres of the early blastocyst arrange themselves into an outer layer called the trophoblast and an inner group of cells attached to the trophoblast called the inner cell mass.It is the trophoblast layer through which the blastocyst attaches to the endometrium,and the inner cell mass differentiates into the embryo.

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