Biology, 27.08.2019 21:00 angi17e

The outer cells of a blastocyst become the , an organ that offers protection and nourishment. once the blastocyst has implanted in the uterus, it is called an . after eight more weeks of development, it is called a .

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The outer cells of a blastocyst become the , an organ that offers protection and nourishment. once t...