[msrenee]

If you asked scientists 30 years ago about some of the extremophile life that we now know to exist, they'd have thought you were insane. They've recently found microbes loving in an asphalt lake in Trinidad. It doesn't have to be an with x% oxygen and x% CO2 and whatever else to support life. It doesn't have to be between -30 and 90 degrees C for things to survive. There's organisms out there that use sulfur compounds for respiration in the way we do oxygen.

So either whatever caused life on Earth was completely unique and couldn't have happened anywhere else, or there's a very good chance there's other life out there. The universe is huge and it's hard for me to believe that earth is the only place where the parameters were met to cause life. From there, it's hard for me to believe that those life forms couldn't adapt to circumstances that are beyond our wildest imagination.