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 |
|---|---|---|---|---|
| 918. | Chieh laptop (leejay8011piq) | 82.88 | 99% | 2018-09-21 |
| 919. | @ _ @ (sundainho) | 82.87 | 97% | 2018-03-22 |
| 920. | cum lover (dotctsk) | 82.85 | 97% | 2020-12-01 |
| 921. | 💉 (milan_) | 82.85 | 96% | 2018-01-05 |
| 922. | Gabriel (tohm) | 82.83 | 98% | 2018-11-28 |
| 923. | Qwerty (qwerty80801) | 82.81 | 99% | 2020-10-02 |
| 924. | JusticeEX (justiceex) | 82.80 | 98% | 2020-06-15 |
| 925. | mfs (mfs_racer) | 82.75 | 97% | 2018-04-21 |
| 926. | CajunMartini (cajun_martini) | 82.75 | 97% | 2020-07-23 |
| 927. | cortmarshal (cortmarshal) | 82.73 | 96% | 2020-12-07 |
| 928. | Bmxyy (bmx30111) | 82.72 | 97% | 2019-07-25 |
| 929. | Eran (umm_eran) | 82.69 | 97% | 2020-12-08 |
| 930. | Nikolaj (nikolaj808) | 82.68 | 96% | 2020-06-25 |
| 931. | Reuben (phyterjet) | 82.64 | 97% | 2018-08-01 |
| 932. | dead (karovin) | 82.63 | 95% | 2018-03-14 |
| 933. | Jason (jasonbetterthanyouall) | 82.58 | 97% | 2020-04-21 |
| 934. | kaitlyn (zapy76) | 82.57 | 97% | 2020-07-26 |
| 935. | yong (topcool) | 82.50 | 96% | 2018-10-26 |
| 936. | ehj53 (ehj53) | 82.49 | 98% | 2019-08-27 |
| 937. | Scott (scottymcraig) | 82.46 | 97% | 2019-03-25 |
| 938. | o.O (yorickvw) | 82.44 | 96% | 2018-05-14 |
| 939. | gab (ggzl1998) | 82.44 | 97% | 2020-11-15 |
| 940. | Tess (makeleletoulalan) | 82.43 | 97% | 2017-11-01 |
| 941. | MooD (xslel) | 82.39 | 97% | 2020-11-17 |
| 942. | Marc (exorbis) | 82.39 | 96% | 2020-03-01 |
| 943. | Mod (modulatus) | 82.38 | 96% | 2020-11-26 |
| 944. | Zach (morcheeba) | 82.36 | 98% | 2020-01-19 |
| 945. | Demancer (demancer) | 82.32 | 98% | 2019-02-21 |
| 946. | Norman (dancingcat) | 82.32 | 97% | 2018-01-15 |
| 947. | Alex (eggstreme) | 82.31 | 96% | 2019-06-18 |
| 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 |