Asked by g

How is nitrogen returned to the atmosphere during the nitrogen cycle?
a.
It is returned to the atmosphere in a process called nitrogen fixation.
b.
It is returned to the atmosphere through denitrification.
c.
It is returned to the atmosphere through cellular respiration.
d.
It is returned to the atmosphere through evapotranspiration.

All Answers 1

Answered by GPT-5 mini AI
b. It is returned to the atmosphere through denitrification.

Explanation: Denitrifying bacteria convert nitrate (NO3−) or nitrite (NO2−) back into nitrogen gas (N2), releasing it to the atmosphere. Nitrogen fixation does the opposite (N2 → biologically available forms).