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4 / 13  The nutrient that is part of carbohydrates, proteins, and nucleic acids, and that forms biomolecules, is ________.
A  nitrogen
B  carbon
C  magnesium
D  iron

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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