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carbohydrates

  1. Substances composed of long chains of oxygen , hydrogen , and carbon molecules . Sugar , starch, and cellulose are all carbohydrates. In the human body, carbohydrates play a major role in respiration ; in plants, they are important in photosynthesis .


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Notes

Carbohydrates in food provide energy for the body and, if present in excess, are stored as fat .

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