A muscle is rich in

Fat

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Protein

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Vitamins

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Carbohydrate

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Solution

The correct option is D Protein
A muscle is rich in protein. The muscle cells contain protein filaments of actin and myosin. Actin is a thin filament and myosin is a thick filament. These protein filaments slide past one another to produce contraction. This results in change in length and shape of the cell.
Thus, the correct answer is 'Protein.'

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