A. nitrates to ammonia
B. ammonium compounds to nitrites
C. nitrogen gas to ammonia
D. nitrites to nitrates
Correct Answer: Option D
D. nitrites to nitrates
A. nitrates to ammonia
B. ammonium compounds to nitrites
C. nitrogen gas to ammonia
D. nitrites to nitrates
Correct Answer: Option D
D. nitrites to nitrates
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