Our hair and nails are composed of _________.

Carbohydrates

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Proteins

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Vitamins

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Fat

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Solution

The correct option is D Proteins
Hair and nails are made up of dead squamous cells which are called as keratinocytes. It consists of a protein known as keratin and is present in hair, nails and skin. It helps in protection as composed of intact cells.
So, the correct answer is 'Proteins'.

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