ChatterBank0 min ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.One way to poceed with this study would be to take advantage of the many experiments that have been taking place naturally for a while now. There are many polluted lakes and rivers out there along with a few pristine lakes and rivers for comparison. By looking at historic data (chemical and biological), you might be able to come some conclusions without killing a bunch of fish.
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