Question

Which process releases nitrogen gas (N2) back into the atmosphere?


decay


nitrification


nitrogen fixation


denitrification

Answer 1

The process that releases nitrogen gas (N₂) back into the atmosphere is **denitrification**. This process is carried out by certain bacteria that convert nitrates (NO₃⁻) and nitrites (NO₂⁻) in the soil into nitrogen gas, effectively returning it to the atmosphere.