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Carbohydrates are organic biomolecules composed of carbon, hydrogen, and oxygen in the general formula $C_n(H_2O)_n$. They serve as primary sources of energy and play structural roles in living organisms. On the basis of the number of saccharide units, carbohydrates are classified into three main categories: monosaccharides, oligosaccharides, and polysaccharides. ______ ______ _______ ________ __________ _______ _____ _______.
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