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Because we don't have the right enzymes in our internal systems is why humans can't digest cellulose. Very Small amounts of cellulose can be found in fruits and vegetables and is
http://answers.ask.com/Health/Diseases/why_can't_h...
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Cellulose is a complex long chain of molecules and very few animals have the capacity to digest them. Digestion is the breakdown of food into smaller and simpler molecules. In order
http://wiki.answers.com/Q/Why+cellulose+not+digest...
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Salam, the answer is simple. The enzyme which digests cellulose in animals is absent in us
http://answers.yahoo.com/question/index?qid=201109...
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Humans can't digest cellulose.
http://wiki.answers.com/Q/Where_is_cellulose_diges...
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