The correct answer is:
whether they carry blood to or away from the heart.
Ultimately, veins and arteries are defined most by:%0D%0A%0D%0A(1 point)%0D%0AResponses%0D%0A%0D%0Atheir different shapes.%0D%0A%0D%0Atheir different shapes.%0D%0A%0D%0Awhether they carry oxygenated blood.%0D%0A%0D%0Awhether they carry oxygenated blood.%0D%0A%0D%0Atheir different sizes.%0D%0A%0D%0Atheir different sizes.%0D%0A%0D%0Awhether they carry blood to or away from the heart.
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