So herbivores inside the sea can carry these bacterial cells that give them the ability to basically break down cellulose, which is a carbohydrate, into its individual sugars and use those sugars as an energy form. Humans, on the other hand, do not have the ability to digest cellulose because they do not have these same bacterial cells inside the sequm portion of our large intestine. So basically, our chi moves from the ilium and into our secum. And the sequm connects our ilium of the small intestine to this section of the colon. Now, the colon is the longest portion of our large intestine and that's because the colon's role is to absorb the water, the ions, the minerals, as well as certain vitamins that have not been absorbed by other organs, by other structures inside our body. So we can divide the colon into four segments.