Life on Mars wouldn't change the question--just the place.
Also, FWIW, there are likely non-bio, natural processes that can render free atmospheric O2. A planet with, say, large oceans and a star close enough or bright enough to free oxygen from water vapor with upper-band UV. In any event, until our telescopes are good enough to see reliable spectral lines in planetary atmospheres a dozen plus light years away, it's all speculation. In short, free oxygen used to be the holy grail sign for life--but that's being reconsidered.
humans did not begin here on earth! prove ME wrong!
Then how come they're not analyzin this on ANCIENT ALIENS!??
Can't be true because it doesn't get enough screen time on ANCIENT ALIENS. look they would be analyzin this theory HEAVILY if it were true!!!
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