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Prairie dogs can run very quickly. This adaptation enables the prairie dog to

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Which layer of the atmosphere contains the greatest amount of water vapor?

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A student uses a high-efficiency gasoline lawnmower to cut grass. The term "high efficiency" is used to indicate that the lawnmower

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A mother hen clucks loudly when danger is near and her chicks quickly gather around her. Which sense helps the chicks receive this warning about danger from their mother?