The outer layer of the blastocyst is called:

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(C) The blastocyst is a structure formed during early embryonic development in mammals. It consists of an outer layer of cells called the $Trophoblast

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Trophoblast

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(C) The blastocyst is a structure formed during early embryonic development in mammals. It consists of an outer layer of cells called the $Trophoblast$ and an inner cell mass. The $Trophoblast$ layer attaches to the endometrium of the uterus and eventually forms the embryonic part of the placenta. Therefore,the correct answer is $C$.

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