How are bacteria important to the genus Rhizobium ?

A) They provide fixed carbon dioxide to legumes.
B) They provide fixed nitrogen to legumes.
C) They carry out photosynthesis.
D) They carry out respiration.
E) They carry out decomposition.

Genus Rhizobium

A group of soil-borne bacteria that form symbiotic relationships with leguminous plants, fixing nitrogen in nodules on their roots.

Bacteria

Microscopic, single-celled organisms that exist in diverse environments and can have roles ranging from decomposing dead matter to causing disease.

Nitrogen

A chemical element with symbol N, atomic number 7; a colorless, odorless unreactive gas that forms about 78% of the earth's atmosphere and is a constituent of all living tissues.