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 |
|---|---|---|---|---|
| 1472. | lonewolf (ilonewolfi) | 72.15 | 96% | 2017-11-27 |
| 1473. | Mason (edwardmason) | 72.13 | 95% | 2017-11-29 |
| 1474. | Kyle (howdydoodat) | 72.05 | 96% | 2018-07-16 |
| 1475. | Adarsha (adarshap) | 72.02 | 96% | 2019-06-01 |
| 1476. | Sardar Taha (dice111) | 72.02 | 95% | 2018-02-18 |
| 1477. | J (fortunapls) | 72.01 | 99% | 2018-09-28 |
| 1478. | omar (33freezing) | 71.97 | 98% | 2020-11-25 |
| 1479. | Tom (tombertoli) | 71.96 | 94% | 2020-02-29 |
| 1480. | llarin (krypton1an) | 71.96 | 97% | 2020-08-13 |
| 1481. | nishinoodles (xjoshh35) | 71.96 | 95% | 2019-06-25 |
| 1482. | Joy (joyyang810035) | 71.95 | 96% | 2020-10-01 |
| 1483. | Akrish (akrish) | 71.92 | 96% | 2019-08-12 |
| 1484. | Autumn (act01) | 71.91 | 96% | 2020-11-06 |
| 1485. | George (turtlerocker) | 71.90 | 99% | 2019-01-25 |
| 1486. | Daniel (doctorfm3) | 71.89 | 93% | 2019-08-16 |
| 1487. | shui (sammi76) | 71.88 | 97% | 2017-11-16 |
| 1488. | Edebus (edebus) | 71.87 | 96% | 2019-01-06 |
| 1489. | Twoja (frosty666) | 71.87 | 95% | 2017-10-16 |
| 1490. | Kombucha (k0mbucha) | 71.85 | 96% | 2020-02-06 |
| 1491. | Akira (akira1957) | 71.76 | 96% | 2018-05-19 |
| 1492. | Shawn (koveus) | 71.73 | 97% | 2019-03-25 |
| 1493. | Eshan (mister_mediocre) | 71.68 | 94% | 2019-04-02 |
| 1494. | ok (herbaltea) | 71.66 | 95% | 2020-09-27 |
| 1495. | jk- (justkidding_) | 71.66 | 96% | 2020-01-27 |
| 1496. | oneguardsam (oneguardsam) | 71.65 | 98% | 2020-05-05 |
| 1497. | ダニー (dannyhehexd) | 71.50 | 96% | 2020-08-18 |
| 1498. | hiKalS (hikals) | 71.46 | 96% | 2017-10-10 |
| 1499. | Ernest (kevinkrish) | 71.42 | 96% | 2018-09-28 |
| 1500. | Michael (whittneyinthetub) | 71.42 | 96% | 2018-03-15 |
| 1501. | CARLO (cjbal) | 71.37 | 97% | 2020-11-01 |
| 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 |