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#Question id: 12434


Nitrifying bacteria participate in the nitrogen cycle mainly by

#Unit 10. Ecological Principles
  1. Converting nitrogen gas to ammonia.
  2. Releasing ammonium from organic compounds, thus returning it to the soil. 
  3. Converting ammonia to nitrogen gas, which returns to the atmosphere.
  4. Converting ammonium to nitrate, which plants absorb.

Answer:- Option(s): 4


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