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The theory of endosymbiosis proposes that certain organelles in eukaryotic cells, specifically mitochondria and chloroplasts, originated from free-living prokaryotic organisms that were engulfed by a primitive eukaryotic host cell. This symbiotic relationship began as a mutually beneficial association, where the engulfed prokaryotes provided metabolic advantages to the host, such as efficient energy production, while gaining protection and access to nutrients. Over time, these prokaryotes became permanent residents within the host cell, evolving ____ ________ _________ _______ ___.
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