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1.	On a cold day, blood vessels in the skin:
A.	Dilate, allowing blood to keep the skin warm.
B.	Constrict, forcing blood to flow through vessels in the skin.
C.	Constrict, reducing heat loss from blood at the surface.
D.	Dilate, causing blood to pass through the cold skin more quickly.
Answer» D. Dilate, causing blood to pass through the cold skin more quickly.

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