I don't think Fermi's paradox is much of a paradox. Really, it is a strawman. The universe is immeasurably large (quite literally; we can only detect and thus measure what is inside the observable universe) not only in space but also in time. That we have not made contact is probabilistically normal. We have only been looking for the past 50 or so years and have only been emitting manmade radio waves for the past 100. That is such a small time as to not even be worth mentioning.
From where did life on this planet originate? If pressed to answer, I might say exogenesis. They have already come here and their single-celled, simple forms have become us.
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