Cyanobacteria and the bacterial genus Rhizobium are both known to contribute to the environment by

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Cyanobacteria and Rhizobium are both nitrogen-fixing bacteria. They have the unique ability to convert atmospheric nitrogen into a more usable form for plants and other organisms, which helps to enrich the soil and promote plant growth. While cyanobacteria also produce oxygen, this is not their primary contribution to the environment. Decomposing dead matter and producing antibiotics are not mentioned as typical roles of these bacteria.

Cyanobacteria and the Bacterial Genus Rhizobium Are Both Known to Contribute