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 |
|---|---|---|---|---|
| 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 |
| 1625. | Jiang (jghjianghan) | 68.95 | 94% | 2018-12-03 |
| 1626. | Lloyd (lloydd) | 68.94 | 96% | 2020-10-02 |
| 1627. | DWG (lsunixl) | 68.93 | 97% | 2020-05-13 |
| 1628. | TheWetard (thebastard) | 68.92 | 96% | 2019-09-20 |
| 1629. | Coffee (coffeesan) | 68.81 | 94% | 2019-07-11 |
| 1630. | Quinn (peea) | 68.76 | 97% | 2020-11-30 |
| 1631. | Seyoung (seyoung) | 68.74 | 95% | 2018-12-25 |
| 1632. | Bri (tidepodsknuckles) | 68.74 | 97% | 2018-08-16 |
| 1633. | Rena (renanav) | 68.74 | 96% | 2018-12-24 |
| 1634. | A (kmos) | 68.71 | 96% | 2020-03-17 |
| 1635. | victor (swegboi) | 68.70 | 95% | 2017-11-06 |
| 1636. | rk61 (lowda9) | 68.66 | 97% | 2017-12-26 |
| 1637. | Alexander (offbeat5024) | 68.64 | 97% | 2019-12-30 |
| 1638. | abraham (shewdiebro) | 68.58 | 94% | 2018-12-28 |
| 1639. | Ephemeral_ (ephemeral_meatsac) | 68.56 | 95% | 2020-03-26 |
| 1640. | Mahmoud (opssheesh) | 68.50 | 95% | 2020-02-03 |
| 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 |