Pit Stop
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Racer 🌹 Black Rose 🌹 (typingartist2)
Race Number 66658
Date Sun, 25 Feb 2018 23:51:30 +0000
Speed 129 WPM Try to beat?
Accuracy 97.7%
Rank 1st place (out of 2)

Text typed:

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.
Campbell Biology AP Edition (book) by Campbell (see stats)

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