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 |
|---|---|---|---|---|
| 1595. | HotDogRacer69 (eager69) | 69.78 | 97% | 2019-08-08 |
| 1596. | Marcin (marzelin) | 69.74 | 98% | 2018-12-24 |
| 1597. | Ed (raptorofli) | 69.72 | 95% | 2020-11-19 |
| 1598. | No (bambusnippel) | 69.69 | 96% | 2018-04-21 |
| 1599. | teresa (teresamarie) | 69.69 | 97% | 2019-08-02 |
| 1600. | QuietObedientConsent (arrow... | 69.68 | 96% | 2018-11-25 |
| 1601. | Antoni (aachh) | 69.66 | 96% | 2019-09-24 |
| 1602. | Spencer (spencertyper) | 69.61 | 96% | 2019-06-17 |
| 1603. | Lewis (dantan) | 69.61 | 97% | 2018-12-20 |
| 1604. | Wot (ostricheleven) | 69.56 | 96% | 2020-02-02 |
| 1605. | J (sadiputs) | 69.56 | 96% | 2019-03-16 |
| 1606. | Mikha (mikhartani) | 69.53 | 98% | 2018-08-29 |
| 1607. | Evan (lil_effer) | 69.53 | 97% | 2018-03-07 |
| 1608. | Will (shneme01) | 69.51 | 94% | 2019-12-12 |
| 1609. | z (qatarking24) | 69.49 | 94% | 2020-12-01 |
| 1610. | ddp (ddpham) | 69.47 | 95% | 2019-04-08 |
| 1611. | Muhammad (muhenka) | 69.46 | 97% | 2019-09-05 |
| 1612. | cmath (chrismath) | 69.46 | 97% | 2020-12-18 |
| 1613. | Sean (seanmeister) | 69.42 | 95% | 2018-04-21 |
| 1614. | aaron (naruto2141) | 69.41 | 94% | 2020-07-22 |
| 1615. | Hyrum (hyrumcoop) | 69.38 | 97% | 2020-05-11 |
| 1616. | Ricky (cosmocalypse) | 69.30 | 96% | 2018-06-27 |
| 1617. | Joel (phitsuh) | 69.24 | 95% | 2019-12-31 |
| 1618. | -___Sailing_ (chesu) | 69.19 | 96% | 2020-05-24 |
| 1619. | Peter (ptrmai) | 69.13 | 98% | 2020-09-11 |
| 1620. | f1_racer (f1_racer_car) | 69.07 | 97% | 2020-09-07 |
| 1621. | Hadi (charaka) | 69.02 | 98% | 2018-12-24 |
| 1622. | Tristan (tristanjp12) | 69.02 | 94% | 2019-08-08 |
| 1623. | jeff (typecringe) | 68.99 | 94% | 2018-12-24 |
| 1624. | 65best (dunneljir) | 68.96 | 95% | 2019-05-22 |
| 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 |