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Who knows? Water and heat and light may be able to mix up into some other crazy life shit without carbon, oxygen, or DNA. I am absolutely certain that given the amount of planets and stars and space out there, there are more planets with life, and most likely even more planets with life similar to humans. And it might actually usually be that 2 planets in a row with similar amounts of sun both get similar life forms. But I doubt Mars has anything intelligent. It could have some basic cellular muck living in the water, or evidence that there used to be some cellular muck living in the water before it got too cold. Or nothing. Most likely nothing.