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I am sure they all smell. I mean if OWI put some kind of logic into making these creatures up (which they should have, and im sure they did), than they dont dont split evolution in two saying these guys breath these dont. Think logically: most if not all OW creatures are put out against the same or very similar tipe of environments. even in a factory there is clean enough air to survive. It would not have made sense to niglect the fact that there is air. Evolution takes adventage of the environment.
If it would worth it there would be creatures on eart who dont need oxygen, but there are none such.
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There are creatures that don't need oxygen, and even ones that are poisoned by it. eg botulinum bacteria.
About smelling, Sligs can certainly smell (AE intro) and also probably have a nose in all those fleshy tentacles. IMHO, the nose and mouth are separate in Sligs.