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  • Fertilisers in the soil are flushed into bodies of water by rainwater
  • Nutrients in the fertilisers enter the bodies of water and dissolve
  • Nutrients in the fertilisers promote the growth of the aquatic plants
  • The algae starts to bloom, reducing the amount of sunlight entering the body of water and preventing sunlight from reaching the plants
  • As the plants die, they are broken down by bacteria decomposers, using up more oxygen in the water and producing more carbon dioxide
  • The oxygen level in the body of water drops to the point where life is impossible. Plants and organisms all die together with the ecosystem
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