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When a thin slice from an onion is viewed through a microscope, lots of little box-like shapes are seen. These shapes are most likely

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Which best describes the role of the esophagus in digestion?

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A worker needs to load a heavy box onto a truck. The worker uses a ramp to move the box because the ramp

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While studying the relationship between number of trees and amount of atmospheric oxygen, which of the following would be most important to take into account?