Definition of "endosymbiosis" []

• A condition of living within the body or cells of another organism. (noun)

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• "Co-evolution is also not mentioned in the current version of this article, nor is endosymbiosis, which is thought to explain the appearance of mitochondria, chloroplasts, and possibly other organelles."
• "Then there’s endosymbiosis, which is genetically equivalent to complete fusion of two previously independent genomes."
• "He rejects the widely-held notion that endosymbiosis (which led to chloroplasts and mitochondria) was the driving force in the evolution of the eukaryotic cell itself or that it was a determining factor in cellular evolution, because that approach assumes a beginning with fully evolved cells."