biology = difference between arteries and veins (in order)
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arteries carry is pure blood veins carry impure blood
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Veins are less flexible than arteries. They have valves (doors) that open and close to let blood through. ... The chief difference between arteries and veins is the job that they do. Arteries carry oxygenated blood away from the heart to the body, and veins carry oxygen-poor blood back from the body to the heart.
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