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The diagram is a model of one way that materials move across the cell membrane. Oxygen molecules are represented by two red circles. Carbon dioxide molecules are represented by a gray circle with two red circles attached. The left-hand side of the diagram shows the beginning concentrations of the two types of molecules. The right-hand side shows how the molecules have moved over time. sss Which sentence best explains the movement of the oxygen molecules over time?
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The diagram is a model of one way that materials move across the cell membrane. Oxygen molecules are...
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