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Chances are they won't be oxygen breathers anyway.
Don’t be too sure about that. If you look around online, you should be able to find chemistry predictions for intelligent life. While not assuming any compatible chemistry, we can look at some of the basic types of reactions needed to support a life form and the type of environment we assume. Apparently carbon and oxygen based chemistry is most favorable
Do we already have that with the crazy anerobic volcano or the high-temperature deep sea vent dwelling microorganisms or something?