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12 / 49  Nutrient and waste requirements for the developing fetus are handled during the first few weeks by ________.
A  the placenta
B  diffusion through the endometrium
C  the chorion
D  the blastocyst

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Source:  OpenStax, Concepts of biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11487/1.9
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