It's from thinking how truly huge the Universe is, with hundreds of billions of stars & planets out there, even if there's a 1 in a million chance that a planet will have the right conditions for diverse lifeforms similar to Earth, it's very likely that several planets will have lifeforms that evolve in a similar way to Earth out of billions of planets that we don't know about.
I see your thought process, but it's much more than a million percent chance. I'd recommend the book Privileged Planet, where it explains how the chances of life are so slim it's basically impossible,
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