Quote:
Originally Posted by Doug
Natural selection deals with things already here, and sees one population type thrive while another less able diminishes.
Evolution requires new things from old. For example a frog or a frog population perhaps, producing fertile offspring that are not frogs anymore, but some other type or maybe sort of frogs but with some extra qualities that places them in a genus of their own. That is not natural selection, that would be evolution. The observable truth seems to be that anytime there is a mutation it causes premature death, or infertility, or in some other way weakens the mutants, and natural selection will clean up the mess.
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Evolution deals with things already here as well, however when dealing with evolution you have to look at small steps over tens of thousands, hundreds of thousands, or millions of generations. The premise that evolution requires a single generation to produce something completely different (your frog example) does not fit in with the evolution model. It is because of this much larger time scale, and the massive amount of generations, that natural selection combined with micro changes can tie in with evolution.