1. Nitrogen fixing bacteria-convert atmospheric nitrogen into nitrates in soil.
2. When plants are eaten the nitrogen becomes animal protein
3.Dead organisms and waste contain ammounium compounds
4.Decomposers - convert urea, faeces and protein from dead organisms into ammonium compounds.
5.Nitrifying bacteria-convert ammonium compounds into nitrates in the soil.
6.Denitrifying bacteria-convert nitrates into atmospgeric nitrogen and ammounium compounds.
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