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In zoology, the gut, also known as the alimentary canal or alimentary tract, is a tube by which bilaterian animals transfer food to the digestion organs.[1] In large bilaterians the gut generally also has an exit, the anus, by which the animal disposes of solid wastes. Small bilaterians often have no anus and dispose of solid wastes by other means, for example through the mouth.[2]

Animals that have guts are classified as either protostomes or deuterostomes, as the gut evolved twice, an example of convergent evolution. They are distinguished based on their embryonic development. Protostomes develop their mouths first, while deuterostomes develop their mouths second. Protostomes include arthropods, molluscs, and annelids, while deuterostomes include echinoderms and chordates.
For more specific information on digestive organs see digestion#specialized organs and behaviors

go to www.en.wikipedia.org/wiki/Gut_flora.Have a Great Day!!!!!!!

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There is a place in Germany called "STUTGUTT"

I do know how to spell it but it sounds funnier this way.