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 |
|---|---|---|---|---|
| 881. | KP (kp132124) | 83.53 | 97% | 2020-12-07 |
| 882. | [SCC] Ignis (ignis_sphaera) | 83.47 | 98% | 2018-07-22 |
| 883. | Angelfried (angelfri3d) | 83.45 | 96% | 2020-10-28 |
| 884. | Kevin (kapoofin) | 83.43 | 95% | 2018-11-07 |
| 885. | Mmm coffee (orchdork7926) | 83.42 | 97% | 2019-06-18 |
| 886. | Pomf (yummydessert) | 83.41 | 97% | 2018-02-12 |
| 887. | D (ereda) | 83.37 | 98% | 2019-07-04 |
| 888. | Big (pookpok) | 83.33 | 97% | 2019-12-15 |
| 889. | I run on coffee (aspectus) | 83.32 | 98% | 2017-10-12 |
| 890. | Marek (lypa) | 83.30 | 97% | 2019-05-01 |
| 891. | T (tcubesak) | 83.30 | 96% | 2017-10-23 |
| 892. | Joshua (joshuacresse) | 83.29 | 98% | 2019-01-29 |
| 893. | Daniel (dainyal) | 83.29 | 96% | 2020-06-11 |
| 894. | Christopher (pandaloop) | 83.28 | 96% | 2017-10-21 |
| 895. | Bryan (bbryanchoi) | 83.27 | 96% | 2020-05-03 |
| 896. | Cadi (cadihd) | 83.27 | 96% | 2018-01-08 |
| 897. | Cameron (jhill1997) | 83.25 | 97% | 2018-01-08 |
| 898. | bang bang (mjf_18) | 83.25 | 97% | 2019-12-31 |
| 899. | Andy (andyyu2004) | 83.25 | 98% | 2020-04-17 |
| 900. | Chris (chriswck) | 83.23 | 98% | 2020-07-11 |
| 901. | Linfeng (llinfeng) | 83.23 | 97% | 2018-12-28 |
| 902. | Camden (mypenguinbuddy) | 83.18 | 96% | 2020-05-15 |
| 903. | bvckspvce (slowracerx) | 83.14 | 97% | 2018-09-18 |
| 904. | Stea (fracticals) | 83.14 | 97% | 2018-12-28 |
| 905. | Tobias 🥺👉👈 (tobimori) | 83.13 | 97% | 2020-06-03 |
| 906. | Kohei (vvacid) | 83.09 | 97% | 2018-05-17 |
| 907. | Tmo (zvblast) | 83.08 | 99% | 2018-11-16 |
| 908. | J (jhreb) | 83.08 | 98% | 2020-01-25 |
| 909. | 1myvar (chowchunfu) | 83.05 | 96% | 2018-12-10 |
| 910. | svime (svime) | 83.03 | 96% | 2018-12-05 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | October 7, 2017 |
| Instant Death Mode | 3 | 99.10 | January 10, 2019 |
| All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
| New English Texts | 1 | 108.31 | May 26, 2022 |