write the activity about nitrogen fixation
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Nitrogen fixation is a process by which molecular nitrogen in the air is converted into ammonia (NH)
or related nitrogenous compounds in soil.Atmospheric nitrogen is molecular dinitrogen, a relatively nonreactive molecule that is metabolically useless to all but a few microorganisms. Biological nitrogen fixation converts nitrogen into ammonia, which is metabolized by most organisms.
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Most biological nitrogen fixation occurs by the activity of Mo-nitrogenase, found in a wide variety of bacteria and some Archaea. ... An example of free-living bacteria is Azotobacter. Symbiotic nitrogen-fixing bacteria such as Rhizobium usually live in the root nodules of legumes (such as peas, alfalfa, and locust trees).
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