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 |
|---|---|---|---|---|
| 1677. | wlliam (williamqwerty3) | 67.58 | 96% | 2020-12-15 |
| 1678. | SuchBlue (suchblue) | 67.57 | 94% | 2020-11-13 |
| 1679. | ahaha (tugarinovite) | 67.53 | 94% | 2018-04-13 |
| 1680. | David (le_zeblitz) | 67.52 | 94% | 2020-02-25 |
| 1681. | $$$$ (for_fun) | 67.50 | 94% | 2020-09-29 |
| 1682. | Cog (baritune) | 67.49 | 94% | 2020-11-21 |
| 1683. | BR3ND4N (bjlaughs) | 67.48 | 97% | 2020-04-23 |
| 1684. | kream (remmie2k) | 67.41 | 95% | 2018-09-11 |
| 1685. | Stephan (shadwgod) | 67.40 | 96% | 2018-10-16 |
| 1686. | Nicolas (nicklasg) | 67.38 | 97% | 2017-11-04 |
| 1687. | Drey (ellendren) | 67.30 | 95% | 2019-03-19 |
| 1688. | yb (yanbin23) | 67.28 | 94% | 2019-09-20 |
| 1689. | Michael (manbeck) | 67.27 | 97% | 2018-12-11 |
| 1690. | Raymond (raymonds) | 67.26 | 98% | 2018-12-05 |
| 1691. | Edward (getrekt112) | 67.24 | 97% | 2018-07-10 |
| 1692. | ??? (teslacia) | 67.20 | 95% | 2020-10-03 |
| 1693. | mickey (c2sulli) | 67.16 | 96% | 2018-06-30 |
| 1694. | Dig (digbo) | 67.11 | 96% | 2017-10-17 |
| 1695. | Willow (bluelagoon7) | 67.10 | 96% | 2019-07-25 |
| 1696. | Tyler (poopbiskit) | 67.08 | 94% | 2019-09-02 |
| 1697. | Rony (ravneet_b) | 67.07 | 97% | 2020-03-31 |
| 1698. | Andrew (amharder) | 67.05 | 95% | 2019-05-03 |
| 1699. | Alex (agnst) | 66.99 | 97% | 2020-11-03 |
| 1700. | Daniel (dring157) | 66.99 | 97% | 2020-01-10 |
| 1701. | Tong (tongvu) | 66.99 | 95% | 2019-11-10 |
| 1702. | Olav (tocke) | 66.91 | 95% | 2020-12-17 |
| 1703. | Andrew (buttmann64) | 66.89 | 96% | 2018-06-30 |
| 1704. | Psycho (psychobrainman) | 66.79 | 98% | 2018-07-30 |
| 1705. | Eric (eibaugh) | 66.79 | 96% | 2018-03-02 |
| 1706. | Solar (solar_nebula) | 66.75 | 96% | 2019-11-24 |
| 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 |