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Effects of pollutants on the aquatic environment

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Figure 4 is a series of six rectangular boxes, one above the other, and connected by arrows pointing downwards. Starting from the top, they have the following wording: increase in organic material in river; increase in decomposers; respiratory oxygen demand; oxygen depleted and different species eliminated according to their tolerances; extent of recovery depends on load and ability for self-purification; oxygen increase, species recolonisation.

 3 Organic materials