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I think the problem is that there seem to be barriers between the species. WIth all the breeding of dogs that has been done, both chihuahuas and Irish wolfhounds are still canis familaris. On the other hand, animals as similar as donkeys and horses do not have fertile offspring. So, although we can produce and observe changes in living organisms, we do not (as far as I know) observe development of new species. And, it doesn't seem to be an issue of time. Scientists who study E. coli are working with about 20 minutes between generations. That is more than 26,000 generations in a year. And yet, as far as I know, no one has gotten it to mutate to a different species of bacteria. If a human generation is 20 years, then 26,000 generations would correlate to 520,000 human years. E. coli has been studied extensively since the 1940's and exposed to much intentionally mutagenic treatment. This time period would correspond to more than 35,000,000 years for human change using this rule of thumb.
So, accepting "micro-evolution" does not automatically yield to a conclusion that life developed from non-life by chance processes.
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