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 |
|---|---|---|---|---|
| 1242. | 🌠Rubby🌠(mikerubby) | 76.55 | 97% | 2020-02-09 |
| 1243. | mood (aquariusflower) | 76.53 | 97% | 2018-12-25 |
| 1244. | KripTed (kripted) | 76.51 | 96% | 2018-07-22 |
| 1245. | Senecaz (senecaz) | 76.49 | 98% | 2018-01-05 |
| 1246. | Phu (sleepiness) | 76.48 | 97% | 2018-12-30 |
| 1247. | Micaherl (sunsoutbunsout) | 76.47 | 97% | 2019-09-27 |
| 1248. | TehEpikDuck (myskillgroup) | 76.44 | 96% | 2020-07-26 |
| 1249. | Allysohn (allysohn) | 76.37 | 94% | 2020-11-15 |
| 1250. | Vinh (vista32493) | 76.36 | 96% | 2020-09-25 |
| 1251. | Trenten (guitars12) | 76.32 | 95% | 2020-03-26 |
| 1252. | huddled (haraldgb) | 76.30 | 97% | 2020-06-05 |
| 1253. | dedknd (dedknd) | 76.29 | 98% | 2020-08-24 |
| 1254. | kauron (kauron) | 76.27 | 96% | 2019-04-05 |
| 1255. | semimak (idimoku) | 76.24 | 96% | 2020-11-04 |
| 1256. | TW (trwo) | 76.23 | 98% | 2018-10-25 |
| 1257. | ឵឵ (omgitzisquidi) | 76.18 | 98% | 2019-06-28 |
| 1258. | Tariq (htariq) | 76.17 | 98% | 2019-12-17 |
| 1259. | SilicGK (silicgk) | 76.17 | 95% | 2020-06-22 |
| 1260. | Mendel (mendeljacks) | 76.15 | 98% | 2019-07-11 |
| 1261. | . (tj44) | 76.14 | 95% | 2019-10-03 |
| 1262. | gangreenie (gangreenie) | 76.13 | 98% | 2019-12-03 |
| 1263. | amy (rose51203) | 76.00 | 96% | 2020-06-11 |
| 1264. | Ryan (giantsfan39) | 75.98 | 96% | 2019-05-17 |
| 1265. | SPEXINDER (forest7) | 75.95 | 95% | 2020-09-09 |
| 1266. | Bach (bwv988) | 75.94 | 97% | 2019-08-29 |
| 1267. | . (trihard7) | 75.87 | 97% | 2017-12-11 |
| 1268. | t (zyxx) | 75.86 | 96% | 2019-08-27 |
| 1269. | Ryan (ramp15514) | 75.86 | 95% | 2020-04-08 |
| 1270. | Jonathan (jonfranche) | 75.86 | 97% | 2020-03-15 |
| 1271. | k (mc0sta) | 75.84 | 97% | 2020-11-14 |
| 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 |