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 |
|---|---|---|---|---|
| 1562. | The (pseudotypist) | 70.35 | 96% | 2020-11-11 |
| 1563. | Jennifer (jenniferzed) | 70.32 | 95% | 2017-10-10 |
| 1564. | slagtherisen (slagtherisen) | 70.27 | 98% | 2018-03-23 |
| 1565. | Jordy (mrollie) | 70.23 | 96% | 2018-02-19 |
| 1566. | Mattias (illmajol) | 70.19 | 97% | 2019-03-12 |
| 1567. | Valk (blankfox) | 70.15 | 97% | 2019-09-03 |
| 1568. | Tomaz (tomaz1502) | 70.15 | 95% | 2019-11-14 |
| 1569. | Madelaine (madtherad) | 70.15 | 97% | 2018-07-22 |
| 1570. | Sora (soralimit) | 70.10 | 96% | 2018-03-25 |
| 1571. | Cal (almostpoetic) | 70.10 | 97% | 2019-01-06 |
| 1572. | XrXr (xrxr) | 70.09 | 95% | 2018-08-02 |
| 1573. | Matthew (tycru) | 69.99 | 95% | 2018-12-05 |
| 1574. | God is love ᗜ (kjb3plover) | 69.97 | 89% | 2019-06-28 |
| 1575. | Chitraketu (alpha1321) | 69.96 | 97% | 2020-03-20 |
| 1576. | Marcus (asdfmango) | 69.96 | 95% | 2018-05-05 |
| 1577. | Jeffrey (jeffrey7212) | 69.96 | 95% | 2019-05-08 |
| 1578. | Zach (encasedthought) | 69.95 | 96% | 2017-10-09 |
| 1579. | Gabriel (gblue1102) | 69.94 | 97% | 2017-10-27 |
| 1580. | JJ (jjbonta) | 69.94 | 96% | 2017-11-29 |
| 1581. | Dylan (dzeddy) | 69.90 | 96% | 2019-04-25 |
| 1582. | Sammy (sammyaxel) | 69.86 | 96% | 2020-07-16 |
| 1583. | Pedro (pedro5370) | 69.81 | 97% | 2019-11-29 |
| 1584. | krabbos (krabbos) | 69.81 | 97% | 2018-06-26 |
| 1585. | HotDogRacer69 (eager69) | 69.78 | 97% | 2019-08-08 |
| 1586. | Marcin (marzelin) | 69.74 | 98% | 2018-12-24 |
| 1587. | Ed (raptorofli) | 69.72 | 95% | 2020-11-19 |
| 1588. | teresa (teresamarie) | 69.69 | 97% | 2019-08-02 |
| 1589. | No (bambusnippel) | 69.69 | 96% | 2018-04-21 |
| 1590. | QuietObedientConsent (arrow... | 69.68 | 96% | 2018-11-25 |
| 1591. | Antoni (aachh) | 69.66 | 96% | 2019-09-24 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | October 7, 2017 |
| Instant Death Mode | 3 | 99.10 | January 10, 2019 |
| New English Texts | 1 | 108.31 | May 26, 2022 |
| All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |