The _____ join up to form veins which empty carbon dioxide rich blood into the heart
Options:
A .  arteries
B .  aorta
C .  veins
D .  capillaries
Answer: Option D : D Arteries transport oxygenated blood to all parts of the body form the heart. On reaching the tissues, arteries divide into capillaries. After delivering oxygen, now the capillaries join to form veins. The veins carry the carbon dioxide rich blood to the heart.
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