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Originally posted by DragonFire1024
There is always something. Lets say something as intelligent as us, if not more so, existed before or at the beginning of the dinosaurs and during. If they were wiped out as a result of the asteroid, we can assume most of them went with the dinosaurs. Point being, anything alive from that era when it hit, would have been ultimately preserved in that layer. The proof is the fossil record we do have from that period. So it would also be likely that we would find (or have already and assuming my last statement, a cover-up) fossils of these bipeds. As to their technology, you assume they had the means to create "plastic" and such. I don't think that is true. If they existed they would have been at a stage as what we would call "cave men". A species of biped to have created any such material would need to have existed a lot earlier than the dinosaurs and their predecessors for there to be absolutely no record of their existence whatsoever. It would also mean that this planet hosted life much earlier than we are lead to believe.
Originally posted by aunkabeatmon
Yeah a interesting as the idea sounds, our planet is lacking evidence to fill the huge gap that suggest prehistoric reptiles advanced into evolved species that inhabit more than one planet. Possibly type 2 civilization?
Originally posted by Pimander
Evolution frequently finds similar ways to adapt too the same environmental challenges. A good example is the number of traits sharks and dolphins share. Sharks evolved from a fish and dolphins evolved from a dog like mammal. They have adapted to their environment in similar ways despite starting from completely different places.
Originally posted by StarblazerUK
reply to post by Versa
Spiders fly without wings
Well, not fly in the original sense, but being small enough with so little mass, they travel on the wind for miles upon miles.
Originally posted by DragonFire1024
I might have missed it. But at least on the first page, no one mentions why none of these fossils of these bipeds have been found (at least to public knowledge). We have found the fossils of dinosaurs that are hundreds of million years old. If these bipeds supposedly existed with the dinosaurs as the OP theorizes, then it would be logical to assume we would have found such fossils, even if rare. This is not so say I don't think it is an interesting theory or that it's not possible, but would be one of the biggest archeological cover-ups of all times.
Originally posted by Pimander
But they also have evolved into many other things too.
It is a popular misconception that evolution is linear. It is more like a tree. Stephen Jay Gould explains this brilliantly in this article.