The process of conversion of $2 NO_{3}^{-} \rightarrow 2 NO_{2}^{-} \rightarrow 2 NO \rightarrow N_{2}O \rightarrow N_{2}$ is called and is carried out by:
- ANitrification,Nitrosomonas
- BDenitrification,Pseudomonas
- CNitrate assimilation,Nitrogenase
- DAmmonification,Bacillus
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