In ______________________ bacteria return nitrogen to the atmosphere by converting nitrates to N₂.

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Denitrification is the process by which bacteria convert nitrates (NO3-) to nitrogen gas (N2), which is released back into the atmosphere. This process occurs primarily in anaerobic conditions, such as in wetlands and soils that are waterlogged or have low oxygen levels. Nitrogen-fixing bacteria convert atmospheric nitrogen to a form that can be used by plants, while nitrification is the conversion of ammonium to nitrite and then to nitrate by other bacteria. Transpiration is the process by which plants release water vapor through their leaves, and respiration is the process by which organisms use oxygen to break down organic matter and release energy.

In ______________________ Bacteria Return Nitrogen to the Atmosphere by Converting