What role do nitrogen fixing bacteria perform in the nitrogen cycle

Nitrogen-fixing bacteria, microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds usable by plants). ... More than 90 percent of all nitrogen fixation is affected by these organisms, which thus play an important role in the nitrogen cycle.

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you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.