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 |
|---|---|---|---|---|
| 1453. | Tizzzay (tizthewizard) | 72.74 | 95% | 2018-12-07 |
| 1454. | kyupii (kyupii) | 72.73 | 95% | 2020-05-21 |
| 1455. | yayeet (repmal) | 72.66 | 95% | 2018-11-10 |
| 1456. | ICKOStreet (ickostreet) | 72.66 | 94% | 2020-05-15 |
| 1457. | Fredrik (falcanen) | 72.61 | 98% | 2017-12-17 |
| 1458. | Bob (bobdebuilder) | 72.61 | 97% | 2018-05-03 |
| 1459. | Connor (c42855) | 72.59 | 98% | 2018-07-04 |
| 1460. | Evan (chubbehmouse) | 72.56 | 96% | 2018-02-18 |
| 1461. | Kenneth (pseudoscience) | 72.55 | 95% | 2019-06-11 |
| 1462. | everyone's favorite (everyo... | 72.53 | 95% | 2020-05-26 |
| 1463. | Donzelle (donnie12) | 72.50 | 96% | 2020-09-29 |
| 1464. | Axee (axri) | 72.48 | 96% | 2020-10-13 |
| 1465. | Neil (xdestroyer2x) | 72.47 | 98% | 2020-02-02 |
| 1466. | João (gomendrown) | 72.46 | 95% | 2017-11-28 |
| 1467. | Phan (hed_wig) | 72.41 | 95% | 2020-03-13 |
| 1468. | Auyox (deadbags) | 72.39 | 95% | 2020-05-10 |
| 1469. | changorilla (changorilla) | 72.37 | 98% | 2018-01-11 |
| 1470. | Jacek (axee) | 72.37 | 98% | 2018-03-17 |
| 1471. | Holly (runningnurse) | 72.37 | 98% | 2018-01-05 |
| 1472. | GNU先輩 (gnuman98) | 72.35 | 98% | 2019-02-08 |
| 1473. | alex (humble_diligent) | 72.35 | 97% | 2019-10-07 |
| 1474. | Macy (macy200200) | 72.34 | 95% | 2019-05-03 |
| 1475. | matt (matterz5) | 72.33 | 96% | 2020-11-16 |
| 1476. | Noximini (noximini) | 72.30 | 96% | 2019-10-01 |
| 1477. | G (zger) | 72.28 | 95% | 2020-01-29 |
| 1478. | Rahul (russellriago) | 72.27 | 97% | 2020-02-28 |
| 1479. | Alex (sidewalkshowdown) | 72.27 | 97% | 2018-12-12 |
| 1480. | Roar (rorsyl) | 72.26 | 96% | 2019-01-29 |
| 1481. | Arnas (dandelionas) | 72.25 | 97% | 2018-10-01 |
| 1482. | Nick (kmkhami) | 72.22 | 96% | 2018-11-14 |
| 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 |