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 |
|---|---|---|---|---|
| 1586. | Lewis (dantan) | 69.61 | 97% | 2018-12-20 |
| 1587. | Wot (ostricheleven) | 69.56 | 96% | 2020-02-02 |
| 1588. | J (sadiputs) | 69.56 | 96% | 2019-03-16 |
| 1589. | Mikha (mikhartani) | 69.53 | 98% | 2018-08-29 |
| 1590. | Evan (lil_effer) | 69.53 | 97% | 2018-03-07 |
| 1591. | Will (shneme01) | 69.51 | 94% | 2019-12-12 |
| 1592. | z (qatarking24) | 69.49 | 94% | 2020-12-01 |
| 1593. | ddp (ddpham) | 69.47 | 95% | 2019-04-08 |
| 1594. | Muhammad (muhenka) | 69.46 | 97% | 2019-09-05 |
| 1595. | cmath (chrismath) | 69.46 | 97% | 2020-12-18 |
| 1596. | Sean (seanmeister) | 69.42 | 95% | 2018-04-21 |
| 1597. | aaron (naruto2141) | 69.41 | 94% | 2020-07-22 |
| 1598. | Hyrum (hyrumcoop) | 69.38 | 97% | 2020-05-11 |
| 1599. | Ricky (cosmocalypse) | 69.30 | 96% | 2018-06-27 |
| 1600. | Joel (phitsuh) | 69.24 | 95% | 2019-12-31 |
| 1601. | -___Sailing_ (chesu) | 69.19 | 96% | 2020-05-24 |
| 1602. | Peter (ptrmai) | 69.13 | 98% | 2020-09-11 |
| 1603. | f1_racer (f1_racer_car) | 69.07 | 97% | 2020-09-07 |
| 1604. | Hadi (charaka) | 69.02 | 98% | 2018-12-24 |
| 1605. | Tristan (tristanjp12) | 69.02 | 94% | 2019-08-08 |
| 1606. | jeff (typecringe) | 68.99 | 94% | 2018-12-24 |
| 1607. | 65best (dunneljir) | 68.96 | 95% | 2019-05-22 |
| 1608. | Jiang (jghjianghan) | 68.95 | 94% | 2018-12-03 |
| 1609. | Lloyd (lloydd) | 68.94 | 96% | 2020-10-02 |
| 1610. | DWG (lsunixl) | 68.93 | 97% | 2020-05-13 |
| 1611. | TheWetard (thebastard) | 68.92 | 96% | 2019-09-20 |
| 1612. | Coffee (coffeesan) | 68.81 | 94% | 2019-07-11 |
| 1613. | Quinn (peea) | 68.76 | 97% | 2020-11-30 |
| 1614. | Seyoung (seyoung) | 68.74 | 95% | 2018-12-25 |
| 1615. | Rena (renanav) | 68.74 | 96% | 2018-12-24 |
| 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 |