Answer
A
Work Step by Step
Nitrogen fixation is what we humans use to produce fertilizer. By doing so, we allow NO3- to become more readily available for plants to use.
Environmental Science for AP* (2nd Edition)
by Friedland, Andrew J.; Relyea, Rick
Published by
W. H. Freeman
ISBN 10:
1464108684
ISBN 13:
978-1-46410-868-6
Unit 2 - AP Environmental Science Practice Exam - Section 1: Multiple-Choice Questions - Page 180: 6
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