Final answer:
Fiber is a non-digestible form of carbohydrate, essential for its physiological roles.
Explanation:
Fiber is a non-digestible form of carbohydrate, mainly consisting of cellulose found in plant foods. Unlike simple sugars and starch, which are digestible, fiber passes through the digestive tract without being broken down by the human digestive system.
Learn more about Carbohydrates here:
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