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The nitrogen cycle is a fundamental biogeochemical cycle that describes the movement of nitrogen through the atmosphere, lithosphere, hydrosphere, and biosphere. Nitrogen is an essential element for all living organisms as it forms a key component of amino acids, proteins, nucleic acids, and other cellular constituents. Despite its abundance in the atmosphere, where molecular nitrogen (N₂) constitutes about 78% of air, most organisms cannot directly utilize atmospheric nitrogen. Therefore, nitrogen must undergo specific transformations to become biologically available, linking its reservoirs through complex ecological processes. The primary reservoirs of nitrogen include the atmosphere, soil, water bodies, and living organisms. The ___ ________ ________ _______ ________ ____ _____ ________.
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