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Biology, 22.06.2019 10:00, nyasiasaunders1234
Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins
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Biology, 22.06.2019 13:00, unknown6669
Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.
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