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A student builds a model to show how pollutants move through an ecosystem. In plastic tub, the student places a layer of small marbles and covers it with a thick cloth and adds a layer of sand. The student sprinkles red powdered paint on top of the soil. When the student sprays water onto the model, red color appears in the cloth and in the water in the layer of marbles. Which part of the model represents pollutants introduced by humans
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