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 |
|---|---|---|---|---|
| 538. | Finn (finnark) | 92.78 | 97% | 2019-08-11 |
| 539. | Andy (summermint) | 92.75 | 98% | 2017-10-15 |
| 540. | Kevin (clearlynotkevin) | 92.74 | 98% | 2019-01-11 |
| 541. | amanita! (irving1234028) | 92.72 | 96% | 2019-03-31 |
| 542. | free 21 savage (acholo) | 92.69 | 97% | 2018-12-30 |
| 543. | Zaoxa (enkryptsyon) | 92.67 | 96% | 2020-03-12 |
| 544. | papa=d (diggaxgod) | 92.66 | 97% | 2019-11-21 |
| 545. | ジョーヨ (joeyo) | 92.62 | 98% | 2018-12-04 |
| 546. | Kacper (frgtn) | 92.60 | 97% | 2018-05-10 |
| 547. | Evan (evanjmckenna) | 92.58 | 96% | 2019-02-19 |
| 548. | Arach (sun_not_real) | 92.54 | 98% | 2020-10-11 |
| 549. | Aisha (mommaveg) | 92.53 | 98% | 2019-04-22 |
| 550. | Yaseen (bananabeast) | 92.44 | 95% | 2019-09-05 |
| 551. | Radha (tostytoast) | 92.39 | 98% | 2020-11-16 |
| 552. | Spencer (soliloquial) | 92.38 | 96% | 2018-05-06 |
| 553. | Ahmadi (transporter) | 92.36 | 96% | 2018-03-30 |
| 554. | Nate (thatguyx) | 92.23 | 97% | 2019-07-29 |
| 555. | Laggy (thefitfatass) | 92.21 | 98% | 2018-12-23 |
| 556. | ari (_paperbird_) | 92.21 | 97% | 2019-04-18 |
| 557. | sos (typeracer_player111) | 92.20 | 97% | 2020-08-30 |
| 558. | aqibm (aqibm) | 92.17 | 96% | 2018-02-19 |
| 559. | (monpre) | 92.17 | 98% | 2020-11-17 |
| 560. | (returned) | 92.17 | 97% | 2020-04-02 |
| 561. | Ashwin (avtrisal) | 92.13 | 96% | 2020-06-27 |
| 562. | oriom (orionrw) | 92.11 | 97% | 2019-09-13 |
| 563. | (atypicaltypist) | 92.03 | 97% | 2018-03-22 |
| 564. | aldrnn (trullama) | 92.03 | 97% | 2020-11-19 |
| 565. | pingu (pingu_workman) | 92.02 | 97% | 2020-05-14 |
| 566. | maybe half the time (framed... | 92.00 | 97% | 2018-03-31 |
| 567. | aud (audimka04) | 91.99 | 98% | 2018-08-10 |
| 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 |