The nitrogen cycle is the process where nitrogen goes through chemical changes. This transformation can be carried out through both biological and physical processes. The processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. When plants and animals die, bacteria convert nitrogen nutrients back into ammonia salts and ammonia. The step of Fixation includes bacteria conversion that is necessary to convert gaseous nitrogen into forms usable by living organisms, which makes nitrogen a crucial component of food production. It is not possible to not include plants, animals or bacteria because if they're wasn't any of these, the cycle couldn't go onto the next step.
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