Nitrogen Fixation: Definition: Conversion of nitrogen gas into nitrates, Done by: Nitrogen fixing bacteria & lightening strikes, Nitrification: Definition: Conversion of ammonia into nitrites & then nitrates, Done by: Nitrifying bacteria (Nitrobacter & Nitrosomonas), Denitrification: Definition: Conversion of nitrates back into nitrogen gas, Done by: Denitrifying bacteria,

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