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Not many planets have, or ever had, sufficient oxygen and water to sustain animal life of any sort. Possibly Mars but certainly no other in the solar system. And even if Mars did sustain animal life, the probability of it evolving into a recognisable ape is very small - you need to evolve jungle and savannah conditions first!
How on earth would we know that other planets never had an atmosphere .... before our time of existence?
How on earth would we know that other planets never had .... plant life before our time of existence?
I think maybe there could be some buried secrets on other planets also maybe?
How do we know that humans did not exist on the moon or likewise on other planets and have been covered up in the same way as the dinosaurs?