Which of the following bacteria is free-livin | vedclass

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(B) $Azotobacter$ is a well-known free-living nitrogen-fixing bacterium found in the soil.It fixes atmospheric nitrogen into ammonia,which is then use

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Azotobacter

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(B) $Azotobacter$ is a well-known free-living nitrogen-fixing bacterium found in the soil.It fixes atmospheric nitrogen into ammonia,which is then used by plants.$Anabaena$ can be free-living or symbiotic,but $Azotobacter$ is specifically characterized as a free-living soil bacterium in the context of biofertilizers.$Spirillum$ is a genus of bacteria,but $Azotobacter$ is the classic example of a free-living nitrogen fixer.

Which of the following bacteria is free-living?

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