Sewage containing organic waste should not be disposed of in water bodies because it causes major water pollution. Fishes in such polluted water die because of:

  • A
    Large number of mosquitoes
  • B
    Increase in the amount of dissolved oxygen
  • C
    Decrease in the amount of dissolved oxygen in water
  • D
    Clogging of gills by mud

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$(i)$ Oxides of sulphur
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$(iii)$ Carbon dioxide
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$(v)$ Smog

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