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a
Nitrogen to Ammonia
b
Nitrate to Nitrogen
c
Ammonia to Nitrite
d
Nitrite to Nitrate
answer is C.
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Detailed Solution
The bacterium Nitrosomonas converts ammonia to nitrite. Nitrobacter converts nitrite to nitrate. Nitrogen is converted to ammonia by Rhizobia, Azotobacter, Beijerinckia, Rhodospirillum, Frankia etc. Nitrate is converted to nitrogen by denitrifying bacteria such as Pseudomonas and Thiobacillus.