(B) $Azotobacter$ is a free-living,aerobic,and non-photosynthetic bacterium that fixes atmospheric nitrogen.$Rhizobium$ is a symbiotic nitrogen-fixing

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(B) $Azotobacter$ is a free-living,aerobic,and non-photosynthetic bacterium that fixes atmospheric nitrogen.$Rhizobium$ is a symbiotic nitrogen-fixing bacterium.$Nostoc$ is a photosynthetic cyanobacterium that can fix nitrogen.$Azospirillum$ is an associative symbiotic nitrogen-fixing bacterium.