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 |
|---|---|---|---|---|
| 1214. | Dmitry (tr0y) | 77.04 | 97% | 2018-10-16 |
| 1215. | Nivekdood (nivekdood) | 77.02 | 96% | 2020-10-12 |
| 1216. | Korbin (korbinmartin) | 77.02 | 97% | 2020-11-07 |
| 1217. | Josephus (josephus) | 77.02 | 96% | 2017-10-19 |
| 1218. | TeJaun (presteej) | 76.99 | 97% | 2019-12-31 |
| 1219. | Kasiourasg (kasiourasg) | 76.99 | 97% | 2019-05-24 |
| 1220. | n (vituperative1) | 76.98 | 97% | 2018-09-25 |
| 1221. | Kimikazee (squalo101) | 76.95 | 96% | 2020-09-13 |
| 1222. | Destiny (dmo9021) | 76.94 | 96% | 2020-04-23 |
| 1223. | Kevin (kevin_he) | 76.93 | 95% | 2018-01-29 |
| 1224. | Tree (thefloatingtree) | 76.92 | 97% | 2019-09-08 |
| 1225. | General (generalmalorn) | 76.90 | 97% | 2020-08-06 |
| 1226. | Robert (mrluigi123) | 76.88 | 95% | 2018-10-09 |
| 1227. | Hukouma (hukouma) | 76.83 | 95% | 2020-07-22 |
| 1228. | ted (sayonara999) | 76.83 | 97% | 2018-12-26 |
| 1229. | Simon (szheng17) | 76.81 | 96% | 2019-10-19 |
| 1230. | China (dvorak_king) | 76.77 | 94% | 2020-09-08 |
| 1231. | Rafi (brownvitalik) | 76.76 | 97% | 2020-08-10 |
| 1232. | Keith (kojiro24) | 76.76 | 96% | 2019-10-24 |
| 1233. | irdyums (irdyums) | 76.70 | 96% | 2018-03-16 |
| 1234. | Fishykek (consigliere) | 76.70 | 97% | 2017-10-13 |
| 1235. | Genesis (buasch) | 76.69 | 96% | 2018-06-17 |
| 1236. | Tim (thole) | 76.64 | 97% | 2019-05-24 |
| 1237. | Rlslngcloud (rlslngcloud) | 76.59 | 95% | 2018-12-14 |
| 1238. | Nikola (shporet) | 76.58 | 98% | 2019-10-14 |
| 1239. | keith (krazedkat) | 76.56 | 95% | 2020-06-13 |
| 1240. | LB (man_onatree) | 76.56 | 96% | 2020-11-12 |
| 1241. | Korey (korizmo) | 76.56 | 96% | 2019-04-27 |
| 1242. | 🌠Rubby🌠(mikerubby) | 76.55 | 97% | 2020-02-09 |
| 1243. | mood (aquariusflower) | 76.53 | 97% | 2018-12-25 |
| 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 |