What is the role of these bacteria in the nitrogen
cycle?

Prokaryotes play several roles in the nitrogen cycle. Nitrogen-fixing bacteria in the soil and within the root nodules of some plants convert nitrogen gas in the atmosphere to ammonia. Nitrifying bacteria convert ammonia to nitrites or nitrates. ... Denitrifying bacteria converts nitrates back to nitrogen gas.

Bacteria release nitrogen into the air, and decomposers break down wastes and remains, returning them to the soil.

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