Biology
Which one of the following is the correct sequence in the order of decreasing length of the structural parts given below of small intestine in the human body?

Jejunum-Ileum-Duodenum
Ileum-Jejunum-Duodenum
Jejunum-Duodenum-Jejunum
Ileum-Duodenum-Jejunum

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Biology
Which of the following is true about veins?

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

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