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In page Endosymbiont:

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According to the theory of symbiogenesis, endosymbiosis played key roles in the development of eukaryotes. Roughly 2.3 billion years ago an archaeon (likely within the "Asgard" superphylum) absorbed an alphaproteobacterium[4] through phagocytosis[citation needed], that eventually became the mitochondria that provide energy to almost all living eukaryotic cells.[5] Approximately 1 billion years ago, some of those cells absorbed cyanobacteria that eventually became chloroplasts, organelles that produce energy from sunlight.[6] Approximately 100 million years ago, a lineage of amoeba in the genus Paulinella independently engulfed a cyanobacterium that evolved to be functionally synonymous with traditional chloroplasts, called chromatophores.[7]