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A specific example is sea cucumbers. I had to take one life science course in college, so I took a biology course. It turns out sea cucumbers don't have a G. I. tract. They are porous and the waste just sort of washes through them. Their entire body is part of their waste disposal system.
Objectively, their excretions aren't that bad and for the most part they have been washed away. I still just can't do it.
It is not unlike people who don't bother to devein their shrimp. Those aren't veins.
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