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Diagram of the intestines.
The main function of the colon is to absorb water. The water and other things get absorbed that feces are formed. The feces is stored in the rectum. The internal sphincter then opens. The external sphincter then decide when to open. When it is open, the feces go out the anus. The appendix is a little pouch that stores good bacteria which can squirt it out. It squirts it out to help digest food.
