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Feces is a product of the inability to digest certain types of food. Due to the diversity of organic nutrients and structure, it is impossible for an organism to break apart every type of nutrient encountered. One example is cellulose ("fiber"), which is a carbohydrate. Cellulose is found in the cell walls of vegetables. A human digestive system cannot hydrolyze cellulose (certain prokaryotes can), and the cellulose is passed through the alimentary canal as waste/feces.

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15y ago

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