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The study of the evolutionary pathways and forces that have shaped life on other worlds, under [environmental] conditions utterly different from Earth's. This field theorizes about how [natural selection] might work in a high-gravity ocean world, under a perpetual twilight, or in a volatile, tectonically [supercharged] environment. It asks how sensory systems, locomotion, and intelligence might develop when the fundamental rules of the game—gravity, chemistry, energy sources—are changed.
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