I can agree that what you said is true. Indeed humans are believed to not have originated from earth as the original species that have evolved here. Why is it that all other animals have not have this ability to built civilizations like how we have. Imagine in the christian saying that humans came from Adam and Eve, if that is true to some extend. Why were they suddenly adults? And weren't from babies. That's just my wild fantasy and imagination.
Maybe that's the aliens plan to conquer planets and one of the planets they have been successful in conquering is Earth. There is a thinking, how could it be that man could just start out with fire and now to the advancement in technology where humans can create nuclear bombs and so on. No scientist on earth has been able to accurately explain what are the early humans like.
Due to this, man has been the most destructive species that has been alive on this planet and has brought extinction to other species. The number of extinct animals are on the rise and one day when the population peaks to maybe around 9 billion and I believe after that it would reduce, then we would see many species of organism in the museums instead of in their natural habitat leaving only those that we eat for food and those we domesticate as pets as animals would be here on this planet.
@A-condor, Soemtimes i feel that we human beings not belongs to this planet and we are aliens. Truth is still hidden we have to wait until truth reveals itself. Stay blessed. 🙂