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10 December, 18:00

Ralph is looking at a blood vessel under a microscope as part of his study about the cardiovascular system. He notices that the vessel contains blood and has valves. Determine the blood vessel being observed.

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  1. 10 December, 20:38
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    Vein because they have valves to prevent back flow of blood.
  2. 10 December, 21:47
    0
    I think the correct answer for this would be the veins. Ralph is observing a vein since he notices that the vessel contains blood and which is the function of the veins - to carry blood around the body. Hope this answers the question. Have a nice day.
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