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ppk ppk
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Valued Member
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Posts: 3561
12 years ago
Uterine implantation due to enzymatic digestion of the endometrium is initiated by the     
A) chorion.
B) trophoblast.
C) endoderm.
D) mesoderm.
E) inner cell mass.
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wrote...
Educator
12 years ago
It's B
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