The buggers were organisms that could conceivably have evolved on Earth, if things had gone a different way a billion years ago. At the molecular level, there were no surprises. Even the genetic material was the same. It was no accident that they looked insectlike to human beings. Though their internal organs were now much more complex and specialized than any insects, and they had evolved an internal skeleton and shed most of the exoskeleton, their physical structure still echoed their ancestors, who could easily have been very much like Earth’s ants. “But don’t be fooled by that,” said
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