Endosymbiogenesis describes evolution as an accumulation of symbiotic mergers.
The theory was initiated by Mereschkowski who correctly assumed that chloroblasts derive from Cyanobacteria and added by Wallin who came up with the idea that mitochondria are bacteria too. However not until Margulis published her books this this theory became widely accepted.
Still her 'extreme' endosymbiogenesis includes assumptions that remain to be proved completely.
