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Nitrogen is an essential element for all living organisms, as it is a key component of amino acids, proteins, nucleic acids, and other cellular constituents. The nitrogen cycle describes the movement of nitrogen through the atmosphere, soil, water, and living organisms, maintaining its availability in ecosystems. The primary reservoirs of nitrogen include the atmosphere, which contains about 78% nitrogen gas (N₂), the soil in the form of organic matter and inorganic compounds like ammonium (NH₄⁺), nitrites (NO₂⁻), and nitrates (NO₃⁻), and living organisms that incorporate nitrogen into biomolecules. The nitrogen cycle begins with nitrogen fixation, a process that converts atmospheric nitrogen (N₂) into ____ __________ _______ ________ __________ _______ _______ ______ __________ _________ _____ _____.
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