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Yes, please explain to me how birds, reptiles, and primates are not different from one another.
If you tell me it's because they're all made up of G's T's C's and A's, you're not going to win any points.
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Oh, they are definitely different. Just as a heap and a grain of sand are different. But there was never a first heap, and there was never a first bird. The point is, we call them "birds" and "primates" based on their endpoints. These endpoints are very easy to distinguish from each other, because they are thousands/millions of generations apart. The point is, if we had followed them, generation to generation, there would never have been an animal that we would call a BIRD and one we would call a REPTILE sitting next to each other. Just as, if we add one grain of sand at a time, there is never a point where we say "NOW this is a heap."
As RDuke mentioned, ring species are fascinating and illustrate this as well, but we'll see what questions you have with this first before moving on.
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Here is the thing. You could define a heap of sand to be something like "any pile with more than 5,000 grains in it." Then, there would be a clear point at which your pile became a heap, and this paradox is resolved. But most people would think your definition was ludicrous. But lets just pretend we accept it, and apply it to evolution.
A bird is any organism that, defined a posteriori, has 50% of the genes that modern birds have. Under this definition, there probably WAS a first bird, although maybe his offspring weren't birds, and then theirs were, as they hovered around the 50% point for a few generations. But we can ignore that. There was now a first bird. I'm going to call him Tweety. Who did Tweety mate with? Why, all these reptiles, of course. Because he isn't going to be reproductively isolated from them, not in the least, he is WAY to closely related. He had little birdtile babies with all the reptiles, and he probably never knew he was (some idiots definition of) the first bird ever!
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Exactly.
Show me your fossilized skeletal remains of all the "birdtiles" over the last few billion years and I'll jump on your bandwagon.
What, you can't? Precisely.
So stop trying to pretend your version of history is scientific fact.
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Here is a good example of a "birdtile":
Archaeopteryx