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(a) Why is small intestine in herbivores...

(a) Why is small intestine in herbivores longer than in carnivores ?
(b) What causes movement of food inside the alimentary canal?

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Cellulose forms the largest part of an herbivore's food . Digestion of cellulose takes a longer time , because the enzymes are produced by the ruminant bacteria that live in the gut of the herbivore. Longer small intestine ensures that the food stays for a longer duration and proper digestion is possible. In the case of carnivores, cellulose is not present in the diet thus the length of small intestive in less.
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