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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Answer is A. This is because it takes no energy and is natural for particles to go from high to low concentration. Think of a packed room. If the door opened it would take no energy for people to flow out. It would take a lot of energy for more people to get crammed in the room the room though (going from low to high concentration)

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