Biology
Bleeding of gums, falling of teeth, fragile bones and delayed wound healing occur due to the deficiency of which one of the following vitamins?

Vitamin C
Vitamin D
Vitamin B
Vitamin K

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Biology
Which of the following is true about veins?

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
Veins have a smaller diameter lumen than arteries

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