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How about the digestive system?
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How many holes do you got @NachBarcelona@piefed.social?
I think topologically I have only those:
No piercings or anything, so that's it.
Skin pores.
I didnt include them for the same reason I didn't include the ears or the urinairy tract (they're not "holes" as in tunnels, topologically speaking), but if your definition differs from mine then you're right.
They go all the way thru the skin, but not all the way thru the body, so I guess you're right.