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 |
|---|---|---|---|---|
| 592. | engie (edrian_a) | 91.05 | 96% | 2020-12-05 |
| 593. | PogChamp (siktaukboi) | 91.01 | 97% | 2020-10-02 |
| 594. | Sik (briandec20) | 91.01 | 97% | 2020-08-24 |
| 595. | Luna (omgitstheyang) | 91.00 | 97% | 2018-02-04 |
| 596. | Mark (orbit191) | 90.99 | 96% | 2020-09-20 |
| 597. | André (andreabadesso) | 90.94 | 97% | 2018-10-28 |
| 598. | Hengky (hengkysanjaya) | 90.92 | 97% | 2019-03-15 |
| 599. | asdf (kangarrou2) | 90.90 | 98% | 2017-12-31 |
| 600. | Esdras (mausloch) | 90.86 | 98% | 2019-07-01 |
| 601. | roadto120avg (242sonic) | 90.73 | 97% | 2019-12-28 |
| 602. | Lyer (lyerlyer) | 90.69 | 96% | 2020-07-06 |
| 603. | (sputype) | 90.67 | 97% | 2018-07-16 |
| 604. | anurag (sabanurag) | 90.60 | 96% | 2020-12-18 |
| 605. | Austin (_8(|) (atrain742) | 90.58 | 97% | 2017-12-11 |
| 606. | Mazhar Andalib (mazharandalib) | 90.55 | 97% | 2020-02-17 |
| 607. | hr/ (doadam) | 90.54 | 97% | 2018-02-24 |
| 608. | Jai (jaideepjr) | 90.53 | 98% | 2017-11-15 |
| 609. | sawyer (tdsg) | 90.52 | 97% | 2020-10-22 |
| 610. | Matthew (d3f1n3d) | 90.51 | 97% | 2017-11-06 |
| 611. | todd (prettyflower27) | 90.50 | 96% | 2020-11-05 |
| 612. | TvDM (lovelyscream) | 90.43 | 97% | 2018-01-09 |
| 613. | c (bigsee) | 90.43 | 97% | 2018-11-17 |
| 614. | (1000_) | 90.38 | 96% | 2019-10-20 |
| 615. | LA LUNA, LA BELLA LUNA (fee... | 90.34 | 96% | 2019-06-16 |
| 616. | tama (tama12111) | 90.28 | 96% | 2020-06-08 |
| 617. | Warphoenix1 (warphoenix1) | 90.27 | 98% | 2020-10-07 |
| 618. | Kitty (kxkixi) | 90.26 | 97% | 2019-12-18 |
| 619. | arturia_ex (koitanami) | 90.24 | 98% | 2019-09-08 |
| 620. | Hugh (mrpiface101) | 90.22 | 97% | 2020-05-20 |
| 621. | SCM (smusson) | 90.21 | 98% | 2020-11-07 |
| 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 |