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The "habitable planet" proof you require is very deceptive. Everything we need may not be what other life forms might need.

Water would be poisonous to a silicon based life form. We have cells here on Earth that are anaerobic, so oxygen would hurt them.


[URL unfurl="true"]https://www.nbcnews.com/mach/science/silicon-based-life-may-be-more-just-science-fiction-n748266[/URL]