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All of the following are products of the nitrogen cycle EXCEPT:
  1. N2
  2. NO3
  3. NO2
  4. NH3
  5. O2
Explanation
Answer: E, O2. The nitrogen cycle produces N2, NO3, NO2, and NH3.

Key Takeaway: Nitrogen is the most abundant element in the atmosphere and essential to all life. The nitrogen cycle is the process by which bacteria and plants convert pure nitrogen into more usual nitrates. Ammonia is released as a waste product and recycled into pure nitrogen by denitrifying bacteria. While oxygen is used by the nitrogen cycle, it is not produced as a product.
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