Evolutionists have no more evidence that any species evolved exclusively on this planet than there is evidence for life to have been engineered or delivered by extraterrestrials.
In fact, the evidence is quite the contrary. The earth did not come from itself, it also came from somewhere else and life as a consequence came from somewhere else. Who or what it came from is another question.
Francis Crick (co-discover of DNA), after seeing how DNA worked, realized it didn’t evolve according to Darwin’s theory. He surmised that an intellegent being created it as a seed for life. An alien being that sent it out into space. (Of course, if you don’t believe in God, I guess you are left with aliens firing rockets with globs of DNA in them as your theory).
Let's see if I can correct your logic here.
Evolutionists have no more evidence that any species evolved exclusively on this planet. than There is NO evidence for life to have been engineered or delivered by extraterrestrials.
Now doesn't that sound much better? ;-)