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 |
|---|---|---|---|---|
| 854. | Keyboard (yusong) | 84.34 | 98% | 2018-08-16 |
| 855. | (lwycsrc) | 84.32 | 96% | 2020-04-01 |
| 856. | Steven (szh02) | 84.27 | 96% | 2019-10-18 |
| 857. | A (fdsjaklfdsaj) | 84.26 | 97% | 2020-10-15 |
| 858. | J (jyorange) | 84.24 | 97% | 2018-08-05 |
| 859. | Tung (dungtang) | 84.23 | 96% | 2020-03-25 |
| 860. | ruru (awestrike) | 84.15 | 98% | 2020-05-09 |
| 861. | Alasdair (coolmanic) | 84.13 | 96% | 2020-03-07 |
| 862. | Noah (snugsy) | 84.11 | 97% | 2018-11-27 |
| 863. | Ivan (ichauster) | 84.05 | 95% | 2017-12-07 |
| 864. | EdJr (edjr) | 83.99 | 99% | 2018-05-05 |
| 865. | you deserve to exist (charmx) | 83.92 | 96% | 2020-10-03 |
| 866. | Alex (aqin24) | 83.92 | 96% | 2018-05-14 |
| 867. | ☻ (sachinjangra0) | 83.90 | 97% | 2018-04-15 |
| 868. | Marley (mbullock) | 83.86 | 98% | 2017-10-25 |
| 869. | Joey (minecandy) | 83.84 | 97% | 2019-04-11 |
| 870. | typeyMcTypeFace (mslib9) | 83.78 | 97% | 2019-02-28 |
| 871. | nevermispelled (nevermispel... | 83.77 | 97% | 2020-05-05 |
| 872. | Angel (angel8192) | 83.77 | 99% | 2018-08-14 |
| 873. | David (dcoh91) | 83.76 | 98% | 2020-06-05 |
| 874. | 初めは40wmp (hajime40) | 83.75 | 98% | 2020-05-13 |
| 875. | tstats[siriusvega] (siriusv... | 83.75 | 96% | 2020-10-29 |
| 876. | (jyinnonquit) | 83.73 | 97% | 2018-02-20 |
| 877. | Ploushz (ploushz) | 83.71 | 97% | 2018-01-03 |
| 878. | Ritchie (kuupper) | 83.70 | 96% | 2020-11-01 |
| 879. | jaso (jasocanfly) | 83.68 | 97% | 2019-12-10 |
| 880. | Kris (kris_z) | 83.66 | 96% | 2020-02-24 |
| 881. | Undisclosed (thetechnicalfox) | 83.65 | 96% | 2018-07-31 |
| 882. | Collin (pringlescan) | 83.63 | 96% | 2020-11-12 |
| 883. | a (levelupself) | 83.63 | 97% | 2020-11-26 |
| 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 |