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Which statement best describes how materials move naturally? a. materials move from an area of high concentration to an area of lower concentration, or down the concentration gradient. b. materials move from an area of low concentration to an area of higher concentration, or up the concentration gradient. c. water is the only substance that can move down a concentration gradient. d. materials require energy to move up & a down their concentration gradients.
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Which statement best describes how materials move naturally? a. materials move from an area of high...
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