The graph illustrates the relative quantities of bacteria and dissolved oxygen at several points along a river. Fertiliser has found its way into the river. At what distance along the river did the fertiliser enter the river?
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Biology 0610 · IGCSE · Pollution
The graph illustrates the relative quantities of bacteria and dissolved oxygen at several points along a river. Fertiliser has found its way into the river. At what distance along the river did the fertiliser enter the river?