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Mitochondria and chloroplasts display similarities with bacteria that led to the endosymbiont theory. This theory states that an early ancestor of eukaryotic cells engulfed an oxygen-using non-photosynthetic prokaryotic cell. Eventually, the engulfed cell formed a relationship with the host cell in which it was enclosed, becoming an endosymbiont, a cell living within another cell. Indeed, over the course of evolution, the host cell and its endosymbiont merged into a single organism, a eukaryotic cell with a mitochondrion. At least one of these cells may have then taken up a photosynthetic prokaryote, becoming the ancestor of eukaryotic cells that contain chloroplasts.

—from Campbell Biology AP Edition, a book by Campbell

Active since October 7, 2017.
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11. bailey you LEGEND (mako640) 153.82 99% 2019-06-29
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13. Kathy (florentine) 152.91 99% 2017-11-17
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Universe Races Average WPM First Race
Default (English) 2,496 89.89 October 7, 2017
Instant Death Mode 2 80.05 January 10, 2019