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Biological nitrogen fixation is the biochemical process by which atmospheric nitrogen is reduced to ammonia by certain prokaryotes, including free-living bacteria, cyanobacteria, and symbiotic microorganisms associated with plants. Atmospheric nitrogen is chemically inert due to the strong triple bond between nitrogen atoms, and its reduction requires a _______ _________ _________ _________ _______ _______ _________ _________ ________ __________ ________ _________.
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