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 |
|---|---|---|---|---|
| 1199. | ♿♿♿ (kavalan) | 77.41 | 95% | 2019-03-06 |
| 1200. | Big Tuna (dominicgangx) | 77.37 | 97% | 2019-11-14 |
| 1201. | Ed (eds69) | 77.37 | 97% | 2019-11-03 |
| 1202. | elnino (elnio2803) | 77.32 | 97% | 2018-11-16 |
| 1203. | sugi (dea_agent) | 77.26 | 96% | 2020-04-01 |
| 1204. | KC (hotdogkc) | 77.22 | 98% | 2018-10-14 |
| 1205. | type (ohwow17) | 77.21 | 96% | 2019-11-05 |
| 1206. | Ismail (aismail90) | 77.21 | 96% | 2020-09-28 |
| 1207. | eggs979 (eggs979) | 77.21 | 97% | 2018-06-18 |
| 1208. | yorha (automata) | 77.21 | 96% | 2017-10-15 |
| 1209. | Park Shin Hye (yipaepaen) | 77.19 | 96% | 2018-10-28 |
| 1210. | BobDaAsianBuilda (fortnitef... | 77.08 | 96% | 2019-11-24 |
| 1211. | grimpatron (grimpatron) | 77.06 | 96% | 2019-05-19 |
| 1212. | ☼Nikola☼ (5crownik007) | 77.05 | 95% | 2018-10-31 |
| 1213. | toki (kizunajemini2205) | 77.05 | 96% | 2020-12-09 |
| 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 |
| 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 |