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Eutrophication of a lake is mainly brought about by an excess of:

  1. Adissolved oxygen
  2. Biron and manganese oxides
  3. Cphosphate and nitrate nutrients
  4. Dchloride and sulfate salts

Answer: C

Phosphates and nitrates from fertilisers, detergents and sewage cause rapid algal growth. Decay of the algae later depletes dissolved oxygen.
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