The first essential step in changing atmospheric nitrogen into more usable NH₃ is called ______________ A)nitrification B)denitrification C)ammonification D)biogeochemical cycling E)nitrogen fixation

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The first essential step in changing atmospheric nitrogen into more usable forms is nitrogen fixation, which refers to the process of converting atmospheric nitrogen into ammonia or other nitrogen compounds that can be used by plants and other organisms. Nitrification is the process by which ammonia is converted to nitrate, while denitrification is the process by which nitrate is converted back into nitrogen gas. Ammonification refers to the process by which organic nitrogen compounds are converted into ammonia. Biogeochemical cycling refers to the movement of nutrients (including nitrogen) through biotic and abiotic compartments of the Earth system.

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