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Firstly I think it a bit arrogant to even surmise we're the only lifeform with IQ above 10.
A million monkeys typing for a million years will produce the complete works of Shakespeare (along of course with most other books and novels and possibly quite a few good new ones.)
So RNA/DNA would simply happen given a certain set of values in any situation that warranted it.
65 million years ago, the saurian empire was reduced to ashes.
Who is to say that intelligent saurians would not have evolved in the ensuing period - maybe alongside mammalian proto-human - if we had not been subjected to a comet strike (if that was what put paid to the scaly ones.)
I read a book about it once - West of Eden - great concept.
Wherever the chance for life exists, life will exist in whatever form and style that will allow progenation.
"It's life Jim, but not as we know it." Probably the basis of all of our yearning for the stars. We're boldly going and no one will ever stop us.
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