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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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