All of the following are true of the differences between arteries and veins except
A. veins have one-way valves, but arteries do not.
B. veins collapse when empty, but arteries remain rounded.
C. veins have a thicker tunica externa than arteries.
D. arteries have a thicker tunica media than veins.
E. All of these are true of the differences between arteries and veins.
Answer: C
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