Biology

The correct process is D.Denitrification.

Denitrification is the process by which certain bacteria in the soil convert nitrates (NO₃⁻) into nitrogen gas (N₂), which is released back into the atmosphere. This occurs when dead plant and animal matter decomposes and nitrogen compounds in the soil are broken down, completing the nitrogen cycle.

Here's a brief overview of the other terms to clarify why they are not correct for this process:

A.Assimilation: This is the process by which plants and animals take up nitrogen (in the form of nitrates or ammonium) and incorporate it into their tissues.