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A student made a model of an ecosystem in an aquarium. The student used potting soil to represent land, water to represent a pond, and a lamp to represent the Sun. One limitation of the model is that it does not represent how living things interact with the nonliving parts of an ecosystem. Which way of refining the model would best address this limitation? OD. Putting a timer on the lamp so that it turns off at night OC. Adding a water pump that can circulate the water OB. Placing some aquatic plants in the wa