Nitrogen Fixation, Bacteria and lightning convert nitrogen gas into ammonia or usable nitrogen compounds., Nitrification, Bacteria convert ammonia into nitrites and then into nitrates., Assimilation, Plants absorb nitrates from the soil to build proteins and DNA., Ammonification, Decomposers break down dead organisms and waste, turning nitrogen into ammonia., Denitrification, Bacteria convert nitrates back into nitrogen gas released into the atmosphere..

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