Which of the following statements are true about veins in human circulatory system?

A. All veins carry carbon dioxide-rich blood.
B. Veina have thin walls
C. Veins carry blood from different organs to heart.
(a) B and C
(b) A and C
(c) A, B and C
(d) A and B

Anurag Mishra Professor Asked on 23rd February 2016 in Science.
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