for what we know... heck for what we don't know
there could be a type of life miles underneath Martian terrain... or even on the sun.
Looks like a very active place ;)
At the end all we know is what worked for us in this type of environment.
Hurray for the species that currently live among us and we still haven't been able to identify =) At least they can roam free wherever they are and not be stuck in a zoo heheheh