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7 / 28  The production of healthy erythrocytes depends upon the availability of ________.
A  copper
B  zinc
C  vitamin B 12
D  copper, zinc, and vitamin B 12

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Source:  OpenStax, Human biology. OpenStax CNX. Dec 01, 2015 Download for free at http://legacy.cnx.org/content/col11903/1.3
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