Usage History of 'endosymbiosis'

The following chart shows how frequently 'endosymbiosis' appeared in printed materials over time. For example, the word 'endosymbiosis' occurred 8 times in books in 1934 and 1,438 times in 2008. From 1934 to 2008, the word 'endosymbiosis' was used a total of 25,593 times in books scanned by Google. See Reference: Google Ngram project.

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