Now I'm not sure how much sense this question even makes, but I take it to be correct that virtually all known species use an RNA-DNA genetic system and are observably related to each other, right? This implies they're all descended from the same primordial ancestors, and probably a single microbe. Shouldn't there be other instances of abiogenesis on this planet, and therefore other evolutionary lines of life that are completely unrelated to the most widespread one? Is there a chance this sort of thing might still be happening, and it's just too far out the way for us to notice? It seems like there should at least be some very simple lifeforms in the ocean that have no degree of relation to us at all, and if there aren't, that makes me wonder just how unlikely this occurrence is. Organic matter has been found on Mars, so I'm under the impression this is a fairly simple process in any environment containing sufficient water. I have no idea what I'm talking about, so correct me on any of this, but I'd like to know if such unrelated life exists.