which of these is true about the four spheres of the earth? a. they are all connected b. they do not affect human life. c. they all exist inside the earth d. they have no effect with one another.
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Veins are a type of blood vessel that return deoxygenated blood from your organs back to your heart. These are different from your arteries, which deliver oxygenated blood from your heart to the rest of your body. Deoxygenated blood that flows into your veins is collected within tiny blood vessels called capillaries
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