Which of the following are characteristics of veins?
Options:
A .  
Carry oxygen rich blood
B .  
Thin walled
C .  
They have valves
D .  
Carry carbon dioxide rich blood
Answer: Option A : B, C, and D Veins are blood vessels that carry carbon dioxide rich blood from all parts of the body back to the heart. The veins have thin walls. There are valves present in the veins that allows blood to flow only in one direction, towards the heart.
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