Compare the sizes of b. cereus m. luteus and r. rubrum

B. cereus is a facultative aerobic bacterium, endospore forming and a gram +ve bacteria. They are large organism with 1×3-4µm and widely distributed in nature. B.cereus is commonly found in soil saprophytic organism. 
R. rubrum is a facultative anearbic organism with  size of 800 to 1000 nanometer. This organism is commonly used in alcoholic fermentation under low oxygen condition while M. luteus is a harmless bacterium that is commonly found in water, soil and human skin.They are 0.5-3.5 micrometer in diameter and they are gram +ve bacteria cocci.

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Nerves are problay the number 1 thing in the body