AP BIOLOGY

Detailed explanation-1: -Denitrification is the process that converts nitrate to nitrogen gas, thus removing bioavailable nitrogen and returning it to the atmosphere.

Detailed explanation-2: -Denitrifying bacteria convert the nitrate back into nitrogen gas, which reenters the atmosphere. Nitrogen from runoff and fertilizers enters the ocean, where it enters marine food webs.

Detailed explanation-3: -Denitrifying bacteria are microorganisms that convert nitrates in soil into free atmospheric nitrogen.

Detailed explanation-4: -In the fifth stage of the nitrogen cycle, nitrogen returns to the air as nitrates are converted to atmospheric nitrogen (N2) by bacteria through the process we call denitrification.

Detailed explanation-5: -Denitrifying bacteria, also known as nitrate-reducing bacteria (NRB), refers to a group of bacteria that helps to convert nitrates or nitrites into nitrogen-containing gases. This conversion is crucial for the atmosphere. It completes the nitrogen cycle by recycling nitrogen into the atmosphere.