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Microorganisms are used in brewing,baking,pickling and other food making processes.
They are also used to control the fermentation process in the production of cultured dairy products such as yogurt and cheese.
Use in water treatment
Microbes are used in biological treatment of sewage and industrial waste effluents
Microbes are used in fermentation to produce ethanol
Some microorganisms are useful for commercial production of medicines and alcohal
some microorganisms decomposed the organic waste and dead plants and animal into simple substances and clean up the environment
there are the bacteria in the human gut that produce vitamin K which is essential to blood clotting 
and microbes are also essential tools in biotechnology,biochemistry,genetics and molecular biology.
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