Iblis-
"Why not?
Seriously, the deep meaning you are looking for isn't the business of the class you are trying to insert it into. Science can tell us what, how, even when and where. But it isn't its job to tell us why, not in the sense that you mean. The best "why" science can come up with is, which particular aspect of mutation or natural selection caused this change or that extinction."
I understand the basic principle of evolution means the change from one generate to the next, but I also hear terms like "natural selection", "instinct", and "survival of the fittest" in connection to and explanations of evolution.
So I ask you, what is the driving force behind evolution? Why change at all?
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