Yes, but not for very long. We require a means of waste disposal. Your comment is that evolution means all beings need one opening and a separate exit. I was just pointing out that this is not the case... although I will admit I could be wrong. I just seem to remember having read about a creature without "bumholes".
Well, for reference, there are any number of animals (mostly "primitive" sessile types) which don't have a differentiated digestive system. However, of more derived vertebrates the champ has to be the river turtle
Rheodytes leukops from Australia. It's about 200 mm long, with a 100 mm long cloaca lined with bursae from which it derives some 2/3 of its oxygen. IOW, we have a turtle that poops, breathes, and reproduces through the same hole. Fascinating, no?
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