Nitrogen cycle
The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. This transformation can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification.
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Nitrogen cycle is related to carnivores. Carnivores have muscles to help them hunt but they couldn't use those muscles unless the had APT. And APT comes from Nitrogen.
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