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  • Highly concentrated nutrients are used in agricultural projects , urban factories, and septic or waste management systems
  • Excessive nutrients from fertilisers are flushed from the land into rivers or lakes by rainwater
  • These pollutants cause aquatic plant growth of algae, duckweed and other plants
  • Algae blooms, oxygen is depleted. When algae blooms, this prevents sunlight from reaching other plants. The plants die and oxygen in the water is depleted
  • Decomposition further depletes oxygen: dead plants are broken down by bacteria decomposers, using up even more oxygen in the water
  • Death of the ecosystem: oxygen levels reach a point when no life is possible. Fish ad organisms die
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