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how are microorganisms useful to us class 8 how are microorganisms useful to us class 8 answer how are bacteria useful to us class 8 how are bacteria useful to us class 8 answer how are microorganisms useful to us explain in 10 lines class 8 how are microorganisms harmful to us class 8 explain how microbes are useful to humans class 8 how microorganisms are friendly to us class 8 how are bacteria harmful to us class 8 some microorganisms act as decomposers how are they useful to us class 8
