Biology

The correct process is: d.Denitrification.

Explanation:

Denitrification is the process by which denitrifying bacteria convert ammonia (NH₃) or nitrates (NO₃⁻) into nitrogen gas (N₂), which is released back into the atmosphere. This process closes the nitrogen cycle by returning nitrogen to the atmosphere.

Why the other options are incorrect:

A.Nitrification: This process involves the conversion of ammonia (NH₃) into nitrates (NO₃⁻), not nitrogen gas.

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