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 |
|---|---|---|---|---|
| 1287. | joe (lerler246) | 75.71 | 96% | 2019-09-11 |
| 1288. | cccc (jonathan12panal) | 75.69 | 95% | 2018-02-16 |
| 1289. | nika (nika07) | 75.66 | 98% | 2020-08-09 |
| 1290. | Logan (loganb123) | 75.65 | 97% | 2018-10-31 |
| 1291. | Tinnaphop (mistertfy64) | 75.65 | 96% | 2020-08-27 |
| 1292. | Enrique (optimus_line) | 75.64 | 97% | 2018-07-03 |
| 1293. | lesseH (yung_lesseh1337) | 75.64 | 95% | 2019-09-24 |
| 1294. | hung_trap (qt_trap) | 75.60 | 97% | 2019-01-06 |
| 1295. | Peter (dletastar4) | 75.58 | 97% | 2018-04-21 |
| 1296. | aaa (jackedgar) | 75.58 | 98% | 2019-02-14 |
| 1297. | Cole (pokeopeth) | 75.57 | 97% | 2019-10-20 |
| 1298. | efergodox (efergodox) | 75.56 | 97% | 2019-11-26 |
| 1299. | Markus (mkh90) | 75.55 | 97% | 2020-10-21 |
| 1300. | Laura (laurasee) | 75.51 | 97% | 2020-11-29 |
| 1301. | Delta (jagonu) | 75.48 | 95% | 2018-03-30 |
| 1302. | Simon (spookles) | 75.48 | 97% | 2018-09-14 |
| 1303. | Joey (joeymichaud) | 75.47 | 97% | 2018-11-12 |
| 1304. | Jamber (jamber_onyx) | 75.47 | 98% | 2019-09-24 |
| 1305. | . (majorleaguetyper) | 75.44 | 98% | 2018-06-07 |
| 1306. | Smajo (smajo) | 75.44 | 96% | 2019-07-17 |
| 1307. | Timo (ubulin) | 75.43 | 94% | 2019-05-20 |
| 1308. | bo (biznessmun) | 75.42 | 96% | 2020-09-09 |
| 1309. | ogkatumus (ogkatumus) | 75.42 | 96% | 2020-12-20 |
| 1310. | Delgerskhn (thege) | 75.41 | 98% | 2020-06-18 |
| 1311. | ju yun (schylarker) | 75.33 | 98% | 2017-10-15 |
| 1312. | Orgalorrrrg (orgalorg) | 75.31 | 98% | 2019-10-14 |
| 1313. | China nº1 (patato123) | 75.30 | 96% | 2020-05-12 |
| 1314. | tstats[gravityhurts] (gravi... | 75.27 | 96% | 2020-11-06 |
| 1315. | Oneness (dreamtime) | 75.27 | 96% | 2019-11-22 |
| 1316. | Tim (tim28) | 75.27 | 97% | 2018-07-03 |
| 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 |