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(B) Oxygen enters the water through diffusion and water has the capacity to hold dissolved oxygen. When untreated sewage is discharged into water bodi

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reduction in oxygen

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(B) Oxygen enters the water through diffusion and water has the capacity to hold dissolved oxygen. When untreated sewage is discharged into water bodies,it is rich in organic matter. Microbes present in the water utilize the dissolved oxygen to decompose this organic matter,a process measured as Biological Oxygen Demand $(BOD)$. The higher the $BOD$,the lower the concentration of dissolved oxygen in the water. This depletion of oxygen leads to hypoxia in fish,causing them to die.

Fish die in water bodies polluted by sewage due to

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