A better explanation than I could have mustered.artybloke said:Put it another way:
Were Cro-Magnon and Neanderthal Man any less adapted to their particular environment than we are? The reason they died out is because in the end they either changed into something else, or didn't adapt as a species quickly enough to their environment when it changed.
The problem is that you're tacking a philosophy (the idea of "progress") onto a scientific process that has no inherent purpose. Human beings, of course, do tend to look down their noses at people from the past and think they're "better" than they were then. But that's a subjective, not a scientific, judgement, certainly as regards evolution.
Pure science doesn't make those kind of judgements: it merely reports on what it sees happening. Science has no teleology; it's descriptive not prescriptive.
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