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change in weather patterns around the world.
the outermost layer of the stele or vascular cylinder in a dicotyledonous plant root. Lateral...
disease caused when the arteries that supply the heart muscle become narrowed or blocked by the...
two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to...
a state in which the body has become dependent on a chemical substance in order to function.