Nitrogen (N2) in atmosphere, Denitrifying bacteria (Eg: Pseudomonas sp.), Nitrates (NO3-), Nitrifying bacteria, Amino acids and proteins in plants and animals, Nitrogen fixation, Nitrogen-fixing bacteria in root nodules of legumes, Nitrogen-fixing bacteria in soil, Ammonium (NH4+), Detritus, Detritivore / Decomposer.

Nitrogen Cycle

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