Assertion: biologist's time | /r/HasProperty | insect
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Source sentences:
text: For instance, evolutionary biologists have determined that shells have evolved in at least 18 lineages, the eye only evolved once, flight has evolved four distinct times (insects, pterosaurs, birds, and bats), gliding has evolved on dozens of occasions, an internal skeleton evolved independently only once, and camouflage has evolved hundreds if not thousands of times.