Biology, 21.11.2019 20:31, Squara

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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Valves in the veins support the theory that: a: blood moves in two directions through the vein, b:...