A river that comes from rain, glaicers etc would be a good example of fresh water rivers. Cause the water is coming from something that is most likely been unthouched by man or has been filterd and cleaned from minerals in the ground.
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Even a slight reproductive advantage will eventually lead to the elimination of the less well adapted of two competing species.
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45 mg of caffeine in one cup of instant coffee.
It is the gas that comes with diarrhea.
