The aliens would have to be stupid to list a planet as solved for tens of millions of years after killing off the dominant life forms, because, well, a new one will just evolve in short order, exactly as has happened on earth, and they ought to know this.
The aliens would have to be stupid to list a planet as solved for tens of millions of years after killing off the dominant life forms, because, well, a new one will just evolve in short order, exactly as has happened on earth, and they ought to know this.