Atheism is unreasonable

[dyresand]

That's exactly the position of evolutionary biology. No animal will ever produce offspring of a different species, with the possible exception of certain hybrids. However, the descendants of an isolated population of dogs would be a different dog-like species after 10,000 generations, and after 10,000 more their descendants would be less dog-like and surely no longer capable of interbreeding with main population of dogs this population split off from. However at no point did any animal give birth to offspring that weren't the same species as the parent. If the generation length doesn't change (remains about 2 years), this would take about 10,000 years. Dogs are an interesting case, because although they're all over the world, they've never been completely reproductively isolated (despite the best efforts of breeders), so although artificial selection has produced varieties as distinct as toy poodles and Irish Wolfhounds, they can all still interbreed, with the exception of breeds that are too anatomically different to be able to mate. They remain dogs, due to a combination of continued interbreeding and the fact that artificial selection works much faster than natural selection, so that the morphological changes far outpace the genetic drift that eventually results in genomes being too incompatible for interbreeding to be successful. In our hypothetical isolated dog population, after roughly 60 million years, it would have, on average, as much in common genetically with the original dog population as current dogs have with cats.

Cut the bio-babble and tell me when has the reptile-bird change ever been observed? I mean, it isn't as if there is a thousand differences between the two. Please tell me how that could have ever occured, sir.

pretty much that.. that is evidence enough from a change of reptile from to birds is those scales.