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 |
|---|---|---|---|---|
| 1082. | dean (aydeano) | 79.17 | 96% | 2020-11-26 |
| 1083. | Dog acc (vick02) | 79.17 | 96% | 2020-05-16 |
| 1084. | Tor (partytor) | 79.14 | 96% | 2020-10-07 |
| 1085. | Sam (sonicst) | 79.11 | 95% | 2019-02-03 |
| 1086. | Jeld (jeld) | 79.09 | 98% | 2019-05-06 |
| 1087. | Hrijul (avius) | 79.09 | 95% | 2020-03-12 |
| 1088. | Jeffrey (jophee) | 79.09 | 97% | 2019-02-26 |
| 1089. | Jacob (xgabumanx) | 79.04 | 96% | 2019-07-15 |
| 1090. | Cisco (yizzyweezy) | 79.03 | 95% | 2020-04-14 |
| 1091. | Alexander (torphon) | 78.97 | 98% | 2019-01-06 |
| 1092. | νΈνΈνΌνΌ (f6zqygeti2yql... | 78.97 | 96% | 2020-11-30 |
| 1093. | icosaedru (achimia) | 78.96 | 99% | 2019-06-07 |
| 1094. | Simon (sivara) | 78.93 | 95% | 2020-03-25 |
| 1095. | Jess (switi_pits) | 78.90 | 97% | 2019-08-23 |
| 1096. | Khoi (khoitran) | 78.88 | 98% | 2020-08-25 |
| 1097. | Devids (theneo) | 78.87 | 98% | 2020-05-12 |
| 1098. | Trevor (nutt69) | 78.86 | 96% | 2019-02-15 |
| 1099. | Despacito (mathaddict314) | 78.85 | 96% | 2018-11-28 |
| 1100. | Andre (smallchicken) | 78.85 | 97% | 2017-11-01 |
| 1101. | Salman (blackstrobe) | 78.84 | 96% | 2019-04-18 |
| 1102. | HiroHero (hirohero89) | 78.78 | 98% | 2020-11-25 |
| 1103. | OneTree (onetreeinaforest) | 78.76 | 97% | 2019-03-19 |
| 1104. | trigunateet (trigunateet15) | 78.75 | 98% | 2018-01-19 |
| 1105. | Dvorak (mesingel_dvorak) | 78.74 | 98% | 2020-11-14 |
| 1106. | MINH (shinmyou) | 78.71 | 98% | 2020-03-20 |
| 1107. | FlyingButter (flyingbutter0) | 78.71 | 96% | 2020-08-09 |
| 1108. | |π ππ|SiriusB (bsir... | 78.69 | 95% | 2017-10-07 |
| 1109. | Eugene (eugeneteoh) | 78.67 | 97% | 2020-11-04 |
| 1110. | John (thugger) | 78.67 | 97% | 2019-11-05 |
| 1111. | Broken (brokencog) | 78.66 | 98% | 2018-06-21 |
| 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 |