Molly filled up three 2 liter jars with aged water and placed an aquarium thermometer inside each jar. After a couple of days, she added 1 stalk of Elodea to jar 1, 1 stalk of Elodea and 1 fish to jar 2, and 1 fish to jar 3. Predict what happened in Molly’s experiment. A Because animals and plants are interdependent, the fish in jar 3 quickly ran out of dissolved oxygen and showed signs of distress. B The fish in jar 2 showed signs of distress because the production of oxygen by the Elodea was insufficient. C The temperature in jar 1 dropped too low and the plant died. D Because there were no fish in jar 1, the plant in jar 1 increased in size.
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