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 |
|---|---|---|---|---|
| 1784. | Josh (syztyqus) | 63.87 | 96% | 2020-11-14 |
| 1785. | Sure (ichiraifu) | 63.87 | 96% | 2020-11-28 |
| 1786. | nani (typingfever) | 63.83 | 93% | 2020-04-12 |
| 1787. | Francisco (distribui) | 63.82 | 97% | 2019-02-14 |
| 1788. | Alex (grim_polar_fox) | 63.81 | 96% | 2017-10-14 |
| 1789. | Mohammed (mohammedamarnah) | 63.79 | 95% | 2018-08-29 |
| 1790. | dude (udead1) | 63.71 | 97% | 2020-02-01 |
| 1791. | Viet (vietbui99) | 63.67 | 95% | 2018-08-10 |
| 1792. | July (phi4069) | 63.63 | 96% | 2020-03-26 |
| 1793. | Amber (amadams) | 63.61 | 96% | 2019-09-19 |
| 1794. | Simon (siggyyo) | 63.61 | 95% | 2019-06-18 |
| 1795. | murdr (murdrkeys) | 63.60 | 95% | 2020-06-08 |
| 1796. | HeLLoki (loki_2606) | 63.59 | 97% | 2019-07-13 |
| 1797. | Eric (qwarts) | 63.58 | 94% | 2020-08-10 |
| 1798. | Galatia (xisnyang) | 63.50 | 93% | 2019-12-08 |
| 1799. | Vebjørn (vebzebol) | 63.47 | 95% | 2018-06-07 |
| 1800. | Hoang (mimamimo) | 63.44 | 96% | 2018-06-22 |
| 1801. | Friedrich (drmomake) | 63.34 | 97% | 2018-08-16 |
| 1802. | yousef (yousef_badr23) | 63.29 | 94% | 2020-06-26 |
| 1803. | philly (smudgy123) | 63.29 | 94% | 2020-04-12 |
| 1804. | Karina (kflorez18) | 63.26 | 97% | 2017-12-26 |
| 1805. | Young (a7ive) | 63.26 | 97% | 2019-03-17 |
| 1806. | Elizabeth (lizziemcfizzie) | 63.23 | 94% | 2019-05-24 |
| 1807. | ArañaDelRio (kabsa1985) | 63.23 | 96% | 2019-09-09 |
| 1808. | mj (ilangshot) | 63.18 | 96% | 2020-11-15 |
| 1809. | Dick (hyoihz) | 63.09 | 96% | 2020-11-13 |
| 1810. | Lucas (ookey) | 62.99 | 94% | 2019-02-03 |
| 1811. | Dingli (dinglichao) | 62.95 | 95% | 2018-04-20 |
| 1812. | Kevin (kjax) | 62.93 | 96% | 2019-09-22 |
| 1813. | Sid (cynocid) | 62.87 | 95% | 2020-08-10 |
| 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 |