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Why are vitamin A and vitamin C essentia...

Why are vitamin A and vitamin C essential to us? Give their important sources.

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Vitamin A is essential to our body as its deficiency causes xerophthalmia (hardening of cornea), night blindness and xerosis. Sources: Fish liver oil, carrot, butter, milk.
Vitamin C is essential to us as its deficiency causes scurvy (bleeding gums) and pyorrhea. Sources: Citrous fruits (e.g., oranges, lemon, amla, tomatoes) and green leaf vegetables.
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