Biology
They are organic compounds consisting of carbon ,hydrogen and oxygen present in all living organisms.

Carbohydrates
Proteins
Fats
Minerals

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Biology
Which of the following is true about veins?

Veins are more muscular than arteries
Veins carry blood away from the heart, while arteries carry blood to the heart
Veins have valves; arteries do not
Veins have a smaller diameter lumen than arteries

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