The facts are that we have nothing to compare with besides our own earth, and until we do, there's little point romanticising about incomprehensible lifeforms utilising their environment in such fanciful ways.
Anyway, why do I think intelligent life only exists on earthlike planets? I've mentioned this before in an older topic, but the moon causes the tides. The tides are what encouraged earth's diversity of life, they compete, intelligent life is born, bla, bla, bla.
If what they found on the rock from Mars indicates life, and it formed on Mars as did earth's on earth, then that's a pretty good indication that life is carbon-based, and not some cosmic mist.
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