(A) Micro-organisms,specifically aerobic bacteria,are used in the process of sewage treatment and water purification. In the presence of oxygen,these

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(A) Micro-organisms,specifically aerobic bacteria,are used in the process of sewage treatment and water purification. In the presence of oxygen,these micro-organisms oxidize complex organic pollutants present in the water into simpler inorganic forms,thereby reducing the biological oxygen demand $(BOD)$ and purifying the water.