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How do capillaries differ in structure from arteries and veins?

ACapillaries have smoother muscle tissue than veins.
BCapillaries appear to have a larger diameter than veins
CCapillaries have valves which are absent in arteries.
DCapillaries are only one cell thick and lack smooth muscle.

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champhorses

Capillaries are only one cell thick and lack smooth muscle. Capillaries are tiny and do not have valves.

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The correct answer is D I promise :))

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