Why are bacteria a necessary part of the nitrogen cycle?

Question:- Why are bacteria a necessary part of the nitrogen cycle?

Answer: It is observed that nitrogen cycle biogeochemistry would not be complete without the service of bacteria; Hence, bacteria are valuable tools in this ecological process. It is a group of microorganisms that are involved with several important transitions that turn nitrogen into forms that can be used by plants and other living things. Bacteria and nitrogenase are responsible for changing the oxide nitrogen gas into ammonia as nitrogen is vital in soil quality. According to its function, some are cyanide bacteria, which converts cyanides into harmless compounds, while others are nitrifying bacteria that oxidises ammonia into nitrites and nitrates which are acceptable forms in the plant. Nitrifying bacteria are converted back into atmosphere nitrogen by denitrifying bacteria covering the complete nitrogen cycle. Should these bacterial activities not occur, nitrogen would remain locked in various forms which are improbable for most forms of life to access, thus resulting in distortion of ecosystems and agricultural productivity. In this way, adequately fixing nitrogen compounds, bacteria guarantee the ongoing cycling of the material that is so vital for life on Earth, in the face of the earth.