What is the key difference between veins and arteries?
A. Veins carry oxygen-rich blood; arteries carry oxygen-depleted blood
B. Veins carry blood towards the heart; arteries carry blood away from the heart
C. Veins carry oxygen-depleted blood; arteries carry oxygen-rich blood
D. Veins carry blood away from the heart; arteries carry blood towards the heart
E. None of these choices is correct
Is it C?
Option (C)...Veins carry oxygen-depleted blood; arteries carry oxygen-rich blood
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