Well, that's the thing, we don't know that. If life "as we know it" is the only possible kind, then yes, it will be what we find. If not, then the odds are unknowable that what we find will be anything like ours.
Originally Posted by tommac
There are solid, biological reasons why that pattern is so common. Those reasons apply under most conditions and for any lifeform of a given complexity. They aren't guaranteed to occur in aliens by any means, but neither are they unlikely. Although even if those features are present, they may not form a "face" as we use the term, of course.
One thing is that in movies you always see weird ETs that have two eyes a nose and a mouth. ETs will NOT have 2 eyes a nose and a mouth. That is the signature of life on earth and of evolution here.
STARGAZING: All I see are the lights of a billion places I'll never go. --Howard Tayler, Schlock Mercenary