of coruse this assumes life as "we" know it. How are we supposed to find life we do not know to exist?
(yet?)
but you are right.
the implication of this is indded either that it is such a random luck of the draw as to preclude anything similar eer happening again, OR
that life as it has developed on Earth is the result of sentient involvement of some sort, whether that happened when we went from single cells to multi-cellular organisms, or when humans arose is all guesses.
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