Which proces completes the nitrogen cycle?

The correct answer is "denitrification".

Explanation:

Denitrification is the final step and the one that completes the nitrogen cycle. In this step, microorganisms reduce the nitrates of the soil to nitrogen gas, completing the cycle back to the atmosphere. This process occurs when bacterias such as Pseudomonas and Paracoccus use nitrate as electron acceptors during respiration.

option a and d is the correct answer

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