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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| Rank | Username | WPM | Accuracy | Date |
|---|---|---|---|---|
| 1692. | Alex (agnst) | 66.99 | 97% | 2020-11-03 |
| 1693. | Tong (tongvu) | 66.99 | 95% | 2019-11-10 |
| 1694. | Olav (tocke) | 66.91 | 95% | 2020-12-17 |
| 1695. | Andrew (buttmann64) | 66.89 | 96% | 2018-06-30 |
| 1696. | Eric (eibaugh) | 66.79 | 96% | 2018-03-02 |
| 1697. | Psycho (psychobrainman) | 66.79 | 98% | 2018-07-30 |
| 1698. | Solar (solar_nebula) | 66.75 | 96% | 2019-11-24 |
| 1699. | Beksultan (bexultan) | 66.72 | 97% | 2018-07-26 |
| 1700. | D4MAGED (d4maged) | 66.70 | 95% | 2017-11-27 |
| 1701. | Dener (uchiha__sasuke) | 66.70 | 97% | 2018-05-07 |
| 1702. | Nono (nono11jp) | 66.68 | 95% | 2019-02-08 |
| 1703. | piglet (slaylet) | 66.65 | 96% | 2020-11-11 |
| 1704. | Gabriel (zfar4) | 66.65 | 96% | 2019-10-25 |
| 1705. | spetterpoep (spetterpoep) | 66.61 | 95% | 2020-04-20 |
| 1706. | Riftan (socretho) | 66.61 | 97% | 2018-03-22 |
| 1707. | MS (damanthc) | 66.59 | 98% | 2020-11-27 |
| 1708. | Jeeb (jeebmaster9000) | 66.52 | 96% | 2020-12-06 |
| 1709. | John (robopixels) | 66.52 | 96% | 2018-03-13 |
| 1710. | CK (theshovelking) | 66.51 | 98% | 2018-08-26 |
| 1711. | So (sonastyyy) | 66.50 | 94% | 2019-09-30 |
| 1712. | Not a dog (i_am_learning_to... | 66.43 | 96% | 2019-07-11 |
| 1713. | Tanner (onlytanner) | 66.37 | 96% | 2018-12-05 |
| 1714. | Aaron (theredspartan) | 66.36 | 97% | 2019-08-27 |
| 1715. | victor (victor4132) | 66.34 | 96% | 2020-03-25 |
| 1716. | Sriniketh (srinikethamv) | 66.30 | 97% | 2018-01-08 |
| 1717. | Kameloc (twoddle2) | 66.23 | 97% | 2020-12-11 |
| 1718. | Filip (jyunero) | 66.22 | 97% | 2020-04-11 |
| 1719. | K3VIN (bootunstoppable) | 66.19 | 95% | 2018-06-02 |
| 1720. | Steven (sp1cez) | 66.13 | 96% | 2019-12-06 |
| 1721. | A (gdup) | 66.13 | 96% | 2020-03-29 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | October 7, 2017 |
| Instant Death Mode | 3 | 99.10 | January 10, 2019 |
| All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
| New English Texts | 1 | 108.31 | May 26, 2022 |