http://en.wikipedia.org/wiki/Mouth
The original gut of multicellular organisms probably consisted of a simple sac with a single opening, the mouth. Many modern invertebrates have such a system, food being ingested through the mouth, partially broken down by enzymes secreted in the gut, and the resulting particles engulfed by other cells in the gut lining. Indigestible waste is ejected through the mouth.
The original gut of multicellular organisms probably consisted of a simple sac with a single opening, the mouth. Many modern invertebrates have such a system, food being ingested through the mouth, partially broken down by enzymes secreted in the gut, and the resulting particles engulfed by other cells in the gut lining. Indigestible waste is ejected through the mouth.
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