Humans intervene in the nitrogen cycle in several ways. Which of the following is one of these?
A. Burning fossil fuels adds nitric oxide.
B. Agriculture decreases the production of nitrous oxides.
C. Protecting and replanting forests releases nitrogen.
D. Harvesting nitrogen-rich crops stores nitrogen in the topsoil.
E. Agriculture with fertilizers uses nitrogen in the aquatic systems.
Answer: A
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