en. Denitrifying bacteria reverses the action of nitrogen fixing and nitrifying bacteria by returning nitrogen to the atmosphere as nitrogen gas.I think that the nitrogen cycle is the most important cycle of the ecosystem because it effects the atmosphere and every organism on this earth. The nitrogen cycle is needed to produce nitrogen and ammonia. Nitrogen is crucial for all organisms because it is an essential part of biological molecules such as proteins and nucleic acid. Nitrogen is important to humans because we get protein from the plants that incorporate the nitrogen. Also we use nitrogen as a fertilizer which makes it a big part of our agricultural lives. My conclusion is that the nitrogen cycle is the most important because without it a lot of organisms including humans would not be able to survive. ...
