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‘Biological Oxygen Demand’ (BOD), an important measure used to assess water pollution, refers to?

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1. ‘Biological Oxygen Demand’ (BOD), an important measure used to assess water pollution, refers to?

The amount of oxygen required by microorganisms to decompose organic matter in water

The total dissolved oxygen naturally present in clean water

The total oxygen produced by aquatic plants

The oxygen content specifically required by fish to survive

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