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Bran has a lot of fibre and the human digestive system doesn't have the enzyme that digests fibre, but there are bacteria living in the large intestine that can digest fibre. As they digest, they release gas
The large intestine function is digest to your food
Intestine
intestine
None. Humans can't digest cellulose. Bacteria in the large intestine can digest some cellulose, creating gas and vitamin K.
The large intestines function is to digest your food.
They have a small intestine because dogs are carnivores (they only eat meat). An animal with a large intestine digests fibre as well, which a dog does not eat, and therefore does not need a large intestine!
So it can properly digest and excrete food.
intestine
small intestine
Bacteria
* Part of digestive system * intestines * absorb (small=nutrients large=water)