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the blood vascular system of mammals is known as double vascular system becauseA. A group of veins carry oxygenated and other group conduct deoxygenated bloodB. Oxygenated blood runs from heart ot different organs by one set of veins while deoxygenated blood runs from heart to lung by another setC. The two different systems never meetD. all of the above

Answer» Correct Answer - D


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