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Biology 20 Online
OpenStudy (anonymous):

Which series best illustrates the pathway of blood flow in a closed circulatory system? A. Heart, veins, capillaries, arteries B. Heart, arteries, capillaries, veins C. Heart, veins, arteries, capillaries D. Heart, arteries, veins, capillaries

OpenStudy (anonymous):

they all the same

OpenStudy (anonymous):

b

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