To get from " protoplasmal primordial atomic globule" (as the Gilbert and Sullivan song put it) to sentient upright modern human has required you to mutate new traits over and over in a precisely timely manner for an exceedingly long while. That's much easier said than done, because the process of change is random. You must be prepared to change everything about yourself-shape, size, color, species affiliation, everything-and to do so repeatedly.
The average species on Earth lasts for only about four million years, so if you wish to be around for billions of years, you must be as fickle as the atoms that made you.
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