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Biological nitrogen fixation is a crucial biochemical process in plants, through which atmospheric nitrogen (N₂), which is chemically inert and unavailable for direct use by most organisms, is converted into ammonia (NH₃) or related nitrogenous compounds that plants can assimilate. Nitrogen is an essential element for the synthesis of amino acids, proteins, nucleic acids, and other cellular constituents, making nitrogen fixation vital for plant growth, development, and productivity. This process is carried out by a specialized group of ____ __________ ___ _____ ________ ___ ___ _______ ____ __________ ______ ___.
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