Nitrification and denitrification differ in that ________.
A. nitrification oxidizes ammonia into a still-usable form, whereas denitrification oxidizes a usable form of nitrogen into unusable nitrogen gas
B. nitrification adds a nitrogen atom to an organic compound, whereas denitrification removes a nitrogen atom from an organic compound
C. nitrification produces ammonia whereas denitrification produces the nitrite ion
D. nitrification oxidizes the nitrate ion into unusable nitrogen gas, whereas denitrification oxidizes ammonia into the nitrite ion
Answer: A
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