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5. Cellulose is one of the most abundant organic molecules in the biosphere, but most animals lack the enzymes needed to break it down. Nevertheless, some animals have and can digest a diet high in cellulose because a) cellulose provides essential fatty acids. b) cellulose provides essential amino acids c) their gut microbes break it down d) cellulose is a required nutrient for microbial symbionts. e) the only food supply available to them contains large amounts of cellulose.

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Some animals can have and digest a high cellulose diet as their digestive track consists of microbes that produce cellulase. Cellulase is the enzyme that contributes in tthe break down of celluose into monomers and thus helping it's digestion.

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