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 |
|---|---|---|---|---|
| 1862. | Matej (mattfid) | 60.42 | 97% | 2020-03-05 |
| 1863. | Yamata (yamata2999) | 60.29 | 97% | 2017-12-07 |
| 1864. | Rhys (hondafit) | 60.27 | 95% | 2019-12-13 |
| 1865. | Max (max_pinc) | 60.27 | 96% | 2019-04-16 |
| 1866. | Cameron (cxmxrxn) | 60.17 | 94% | 2018-12-30 |
| 1867. | Ryan (godawesome) | 60.05 | 95% | 2020-05-26 |
| 1868. | ralph (realityloser) | 60.04 | 98% | 2017-11-06 |
| 1869. | Moses (moses297) | 59.99 | 95% | 2018-02-12 |
| 1870. | sount (tbn_ace) | 59.96 | 96% | 2018-01-27 |
| 1871. | Ron (ronald2) | 59.91 | 97% | 2020-03-07 |
| 1872. | Biohazard (b10hazard_) | 59.53 | 94% | 2020-05-05 |
| 1873. | Ruben (ecerulm_kinesis) | 59.41 | 99% | 2019-01-06 |
| 1874. | Melisa (colorsunimaginable) | 59.36 | 97% | 2019-09-24 |
| 1875. | nuradil (nuradil) | 59.33 | 94% | 2017-11-21 |
| 1876. | Mark Stanley (marklibid) | 59.17 | 93% | 2019-10-03 |
| 1877. | Eshan (eshakrani) | 59.16 | 95% | 2018-09-10 |
| 1878. | Richard (jorimi) | 59.15 | 95% | 2020-08-08 |
| 1879. | Fred (fredizzimo) | 59.15 | 96% | 2018-04-25 |
| 1880. | Brian (heykilroy) | 59.14 | 95% | 2017-12-05 |
| 1881. | Hari (magarhari088) | 59.14 | 96% | 2020-11-09 |
| 1882. | Boba (tapiocaman) | 59.07 | 94% | 2020-12-08 |
| 1883. | Rui (ssbebop) | 58.95 | 94% | 2017-11-06 |
| 1884. | Carmel (chunqhas) | 58.91 | 95% | 2019-11-26 |
| 1885. | Darkkiller12 (darkkiller12) | 58.89 | 94% | 2020-02-06 |
| 1886. | David (daychow) | 58.87 | 95% | 2020-07-03 |
| 1887. | Saul (saulvsoto) | 58.86 | 93% | 2020-06-26 |
| 1888. | Rjnal (rjnal) | 58.85 | 96% | 2020-03-07 |
| 1889. | Travis (daltrav1) | 58.84 | 96% | 2017-10-23 |
| 1890. | Neodymium (neodytrium) | 58.82 | 94% | 2020-07-06 |
| 1891. | Cobra (cobra03) | 58.70 | 96% | 2020-06-07 |
| 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 |