MICROORGANISM
Microorganisms are tiny organism which cannot be able to be seen with our naked eyes except with the help of microscope. Microorganism are ubiquitous in nature, (they are found everywhere i.e., in the air, soil, water, cloth, human bodies, etc.
Some microorganisms are beneficial to man while some are harmful. Those which are beneficial to men are called commensal, while those that cause sickness to man or harmful to men are called pathogenic.
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