The following graph shows the concentration of oxygen in a river, measured at stations 1-5, each ...

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The following graph shows the concentration of oxygen in a river, measured at stations 1-5, each 100 Β m apart. A sewage outflow is observed just after station 1. At which stations will the concentration of organic matter be lowest?
(a) 1 and 5
(b) 2 and 3
(c) 3 and 4
(d) 4 and 5

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