Do you think that even finding single celled organisms on Mars could perhaps tell us that there has to be more out there, and in which case, other intelligent life? If someone saw our original ancestor it was probably a cell. Maybe we found cells that could evolve to something much greater...
(cont.) ... If we left it alone for billions of years (assuming we're still here which we probably won't be.
-----------------------------------------------------------
No, finding single-celled organisms on Mars would tell us that there are single-celled organisms on Mars. There doesn't "have to be" anything else just because there's something on one planet. That said, assuming any life found there wouldn't be a result of contamination from Earth it would certainly lend strength to the possibility that life can form naturally on other planets. Then, if our understanding of evolution holds true in those cases there would be a possibility of more complex life. It wouldn't prove anything for any other location than Mars, though.
-----------------------------------------------------------
No, finding single-celled organisms on Mars would tell us that there are single-celled organisms on Mars. There doesn't "have to be" anything else just because there's something on one planet. That said, assuming any life found there wouldn't be a result of contamination from Earth it would certainly lend strength to the possibility that life can form naturally on other planets. Then, if our understanding of evolution holds true in those cases there would be a possibility of more complex life. It wouldn't prove anything for any other location than Mars, though.