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Originally Posted by valarmorghulis
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Sorry but you're wrong. Nobody argues that populations can change over time, that's rather obvious. However, what is argued is the extent to which a population can change. No living thing can change into a different kind of organism than what it is. I've read "The Break of the Finch" but guess what, they are all finches. This is microevolution. Nobody argues that finches can appear differently from one to the next but finches are ALWAYS going to be finches. Much like how no two snow flakes are ever the same, no life form is ever the same. Even "identical" twins are never the same. Show me a finch producing something that isn't a finch or show me something that isn't a finch producing one. That would be the version of evolution you falsely think exists.
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Your brain doesn't comprehend the scale of geologic time.
Whenever a physically distinct portion of a population begins to mate exclusively with itself in order to preserve a morphological advantage, a new species is born.
With enough time and enough change, eventually the classification system which humans created to name and sort the organisms we observe will dictate that a particular population can no longer be called a finch.
Environmental conditions cause patterns to form in the variance of a new generation's physical traits.
You are being fooled by both your inability to think on a time scale which dwarfs your existence and the categorical classification systems our biologists created to make sense of the continuum which describes these natural processes.
Evolution doesn't occur at the snap of a finger.