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(A) In nature,the nitrogen cycle is primarily driven by various microorganisms,especially bacteria. $1$. Nitrogen-fixing bacteria (e.g.,$Rhizobium$,$A

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Bacteria

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(A) In nature,the nitrogen cycle is primarily driven by various microorganisms,especially bacteria. $1$. Nitrogen-fixing bacteria (e.g.,$Rhizobium$,$Azotobacter$) convert atmospheric nitrogen into ammonia. $2$. Nitrifying bacteria (e.g.,$Nitrosomonas$,$Nitrobacter$) convert ammonia into nitrites and nitrates. $3$. Denitrifying bacteria (e.g.,$Pseudomonas$,$Thiobacillus$) convert nitrates back into atmospheric nitrogen. Therefore,bacteria are the most active participants in the nitrogen cycle.

Which organisms actively participate in the nitrogen cycle in nature?

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