Biology
Which of the following is true about veins?

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

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Biology
Kwashiorkor disease in children is caused by

Sufficient fats but deficient vitamins in diet
Sufficient vitamins but deficient fats in diet
Sufficient carbohydrates and fats but deficient proteins in diet
Sufficient carbohydrates but less fats in diet

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