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22 November, 21:17

Valves in the veins support the theory that: A: blood moves in two directions through the vein, B: movement of blood is back and forth through the veins, C: blood circulates through the body, D: blood ebbs and flows in one space

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  1. 22 November, 23:47
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    c

    Explanation:

    because the blood circulates
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