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Originally Posted by bumab
Your added contingency.
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And? What is the contigency for the opposing position? An entire open pathway running from outside the body at one end to outside the body at the other end: from open mouth through open anus. Now, is that the common case? Nope. It's probably a safe bet that no people walk around most of the day with their mouth, and their anus, and all of their GI-tract sphincters open simultaneously. No, the common case is for the GI tract to be closed off in a manner that creates at least one internal compartment ... you know, where ingested food would be :-)
