Just as the gradual extinction of Neanderthals was a result of "natural selection". Dog breeds are a part of natural selection just as humans are a part of natural selection. Would dogs exist without humans? No, but that doesn't mean it still isn't "natural selection".
Neanderthals and modern humans could interbreed very easily.
Neither are classified as the exact same species...
If you honestly believe that the species of humans you would encounter on your walk through Europe are the same as the species of humans you encounter on your walk through Africa, you are very wrong.
Is there a superior race?
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Just as the gradual extinction of Neanderthals was a result of "natural selection". Dog breeds are a part of natural selection just as humans are a part of natural selection. Would dogs exist without humans? No, but that doesn't mean it still isn't "natural selection".
Neanderthals and modern humans could interbreed very easily.
Neither are classified as the exact same species...
If you honestly believe that the species of humans you would encounter on your walk through Europe are the same as the species of humans you encounter on your walk through Africa, you are very wrong.