>>81819827the transparent nature of a bito confirms that while they do have a digestive system, there are no organs so speak of. this probably also means their biology is more inline with that of singe celled organisms.
what they do excrete, outside of non digestible materials, is likely excreted from a single orifice would constitute for both the feces and urine. however the nondigestible objects that somehow entered the membrane might have their won form of removal where the body just rejects them like a splinter