Ammonium ions - NH4+ Ions found in the soil and can be created by free living nitrogen fixing bacteria, Nitrite ions - NO2- ions produced by the nitrification of ammonium ions., Nitrate Ions - NO3- ions produced by the nitrification of nitrite ions. These are absorbed by plants and are needed to produce proteins., Nitrogen fixation - The process by which nitrogen gas is converted into nitrogen containing compounds, Ammonification - The production of ammonia from organic nitrogen., Nitrification - The oxidation of ammonium to nitrites to nitrates which occurs in the soil., Denitrification - The conversion of nitrates into gaseous nitrogen, Free living nitrogen fixing bacteria - Bateria reduce gasous nitrogen to ammonia which they use to make amino acids/, Mutualistic nitrogen fixing bacteria - These bacterai live in nodules on the roots of legumes. They fix the nitrogen from the atmosphere., Nitrogen cycle - The cycling of nitrogen through the ecosystem., Phosphorous cycle - The cycling of phosphorous through rocks, soil, oceans and lakes.,

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