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Oh! I love questions like these. I think that there are evolutions occurring everyday, so in my imagination, in 5000 years, we would appear very different. Maybe because of over exposure to the sun, we would adapt. Have you seen that Outer Limits episode? So cool.
Its possible that we have had several civilizations. The bible even speaks of nations that spoke one language at one time and then branched off into several cultures later. I guess we can use that format.
So what about 1 billion years ago? I think the civilization looked nothing like we do. Maybe had some characteristics similar to us as far as cell structure, but even then--what could they have looked like? Amoebas?
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