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    Exam 17: Ecosystems and Biogeochemical Cycles
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    The Form of Nitrogen That Comprises 78% of Atmospheric Mass
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The Form of Nitrogen That Comprises 78% of Atmospheric Mass

Question 70

Question 70

Multiple Choice

The form of nitrogen that comprises 78% of atmospheric mass and is necessary for biological processes, but unusable by plants is


A) N2.
B) NOx.
C) N2O.
D) NO2.

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