We’re assuming that alien life requires the same things we do, why?
In: Biology
I don’t think we *are* that certain.
But we have no idea what other conditions could lead to life, because the only example we know, in the universe, is us. So we’re assuming that any place that looks kinda like Earth is the best place to find life that looks kinda like life as we understand it.
Water plays a critical roles in our biology, and in our evolution. Water allowed unicellular structures to evolve, since they only needed to develop a membrane and not a skeleton or other support system as they would on land. Oxygen is very useful, but isn’t a strict requirement; there are life forms on earth that don’t use oxygen as much as most organisms do.
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