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Home Q & A Board Science-Related Homework Help Health, Nutrition, and Food Sciences
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mikael mikael
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10 years ago
At approximately day 15, when the implanted blastocyst differentiates into distinct layers of cells, the mass is called a(n):
A) fetus.
B) infant.
C) embryo.
D) placenta.
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padrepadre
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10 years ago
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mikael Author
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10 years ago
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