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  1. The microorganism is a small organism which we cannot see through naked eyes. 
  2. They are also friends of human beings. They help us in many ways. 
  3. Vaccines are made up of microorganisms.
  4. Microorganisms are used in the wine industry, baking industry.
  5. Microorganisms are also used in reducing pollution levels. They are used in the treatment of industrial effluent, sewage waste etc.