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14 / 57  The placenta is formed from ________.
A  the embryo’s mesenchymal cells
B  the mother’s endometrium only
C  the mother’s endometrium and the embryo’s chorionic membrane
D  the mother’s endometrium and the embryo’s umbilical cord

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Source:  OpenStax, Genetics and evolution. OpenStax CNX. Aug 07, 2014 Download for free at https://legacy.cnx.org/content/col11595/1.2
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