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 |
|---|---|---|---|---|
| 1846. | Luke (lukeleblanc15) | 61.47 | 97% | 2020-07-06 |
| 1847. | Manraj (man_123lama) | 61.36 | 96% | 2019-07-26 |
| 1848. | EJ (clarencedc) | 61.23 | 96% | 2020-11-10 |
| 1849. | TSpin (all_type) | 61.13 | 95% | 2019-08-29 |
| 1850. | MikeyS (mcsj120) | 61.09 | 96% | 2019-08-08 |
| 1851. | 707 (bigboss26) | 61.09 | 96% | 2020-12-08 |
| 1852. | zipline (hwiechers) | 61.01 | 96% | 2018-03-22 |
| 1853. | Dean (mtgapless) | 60.83 | 96.4% | 2023-11-13 |
| 1854. | himeh (jherrerra) | 60.80 | 97% | 2020-09-09 |
| 1855. | Antonio (arthur2810) | 60.66 | 97% | 2020-09-06 |
| 1856. | The126thSidhant (cycle1) | 60.53 | 93% | 2020-04-03 |
| 1857. | Jakub (dareon) | 60.49 | 95% | 2017-12-17 |
| 1858. | Pyren (pyren83) | 60.48 | 97% | 2020-09-06 |
| 1859. | Paperclip (akmalreza) | 60.45 | 94% | 2020-07-19 |
| 1860. | Matej (mattfid) | 60.42 | 97% | 2020-03-05 |
| 1861. | Yamata (yamata2999) | 60.29 | 97% | 2017-12-07 |
| 1862. | Rhys (hondafit) | 60.27 | 95% | 2019-12-13 |
| 1863. | Max (max_pinc) | 60.27 | 96% | 2019-04-16 |
| 1864. | Cameron (cxmxrxn) | 60.17 | 94% | 2018-12-30 |
| 1865. | Ryan (godawesome) | 60.05 | 95% | 2020-05-26 |
| 1866. | ralph (realityloser) | 60.04 | 98% | 2017-11-06 |
| 1867. | Moses (moses297) | 59.99 | 95% | 2018-02-12 |
| 1868. | sount (tbn_ace) | 59.96 | 96% | 2018-01-27 |
| 1869. | Ron (ronald2) | 59.91 | 97% | 2020-03-07 |
| 1870. | Biohazard (b10hazard_) | 59.53 | 94% | 2020-05-05 |
| 1871. | Ruben (ecerulm_kinesis) | 59.41 | 99% | 2019-01-06 |
| 1872. | Melisa (colorsunimaginable) | 59.36 | 97% | 2019-09-24 |
| 1873. | nuradil (nuradil) | 59.33 | 94% | 2017-11-21 |
| 1874. | Mark Stanley (marklibid) | 59.17 | 93% | 2019-10-03 |
| 1875. | Eshan (eshakrani) | 59.16 | 95% | 2018-09-10 |
| 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 |