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Biological Oxygen Demand (BO(d) is a standard criterion for
(a) Measuring oxygen levels in blood
(b) Computing oxygen levels in forest ecosystems
(c) Pollution assay in aquatic ecosystems
(d) Assessing oxygen levels in high altitude regions



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Biological Oxygen Demand (BOD) is a standard criterion used to assess the level of pollution in aquatic ecosystems, particularly in water bodies like rivers, lakes, and ponds. It measures the amount of dissolved oxygen consumed by microorganisms while decomposing organic matter in the water. High BOD levels indicate a higher organic pollution load, which can negatively impact the oxygen levels and overall health of the aquatic ecosystem. Therefore, BOD is commonly used as an indicator of water quality and pollution in aquatic environments.


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