Free nitrogen is released to the atmosphere by

Kalaqua

3 months ago

Denitrifying bacteria
Explanation:
In the nitrogen cycle:
Nitrogen-fixing bacteria convert atmospheric nitrogen (N₂) into ammonia.
Nitrifying bacteria convert ammonia into nitrites and nitrates.
Denitrifying bacteria convert nitrates (NO₃⁻) back into free nitrogen gas (N₂), which is released into the atmosphere.
Saprophytic bacteria decompose dead organic matter.
Therefore, the bacteria responsible for releasing free nitrogen back into the atmosphere are denitrifying bacteria.
So, the correct answer is C. Denitrifying bacteria.