Xerophthalmia and Nightblindness are caused due to the deficiency of?

A. Vitamin A

B. Vitamin D

C. Vitamin K

D. None of these

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The number of chambers in amphibians heart is?

A. Two

B. Three

C. Four

D. Five

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What is needed as a source of energy for vital activities of the body?

A. Iron

B. Calcium

C. Water

D. Carbohydrates

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