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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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