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 |
|---|---|---|---|---|
| 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 |
| 622. | Florian (florianholland) | 90.17 | 98% | 2018-02-18 |
| 623. | finish what you start = (ro... | 90.14 | 96% | 2020-11-03 |
| 624. | stefan (kolevstefan) | 90.05 | 99% | 2020-06-02 |
| 625. | Dan (bocadillas) | 90.05 | 98% | 2020-04-19 |
| 626. | Axton (recklessxd) | 90.04 | 98% | 2019-03-05 |
| 627. | Ben (benjiboyyy) | 90.04 | 96% | 2017-10-10 |
| 628. | Guest (catg0ty0urlung) | 90.02 | 98% | 2019-10-08 |
| 629. | David (smawlodon) | 89.85 | 95% | 2020-09-12 |
| 630. | John (xjohnbx) | 89.84 | 98% | 2017-11-14 |
| 631. | Ale (yagotzirck) | 89.82 | 98% | 2018-02-10 |
| 632. | Harrison (hjink94) | 89.76 | 97% | 2018-05-21 |
| 633. | Sabrina (haroldfinch) | 89.74 | 96% | 2018-05-20 |
| 634. | Khai (khaikhai2) | 89.70 | 96% | 2020-03-25 |
| 635. | Baka (bakayen) | 89.70 | 97% | 2020-05-16 |
| 636. | nonquit (bork1) | 89.69 | 98% | 2018-11-23 |
| 637. | Paolo (mcnugget25) | 89.69 | 97% | 2020-12-07 |
| 638. | Zach (salutations443) | 89.68 | 99% | 2019-01-29 |
| 639. | (carrot_) | 89.66 | 96% | 2020-07-01 |
| 640. | burppppp (gotburptodo) | 89.64 | 98% | 2019-01-23 |
| 641. | Riley (rileyborgard) | 89.46 | 98% | 2018-06-13 |
| 642. | Mauwsan (mauwsan) | 89.44 | 98% | 2019-02-20 |
| 643. | Madi (xmatth13) | 89.40 | 96% | 2017-12-28 |
| 644. | Nick (eco_frendly) | 89.37 | 97% | 2020-03-14 |
| 645. | L (xice) | 89.33 | 97% | 2019-09-10 |
| 646. | Speed Cola (zdj361) | 89.31 | 97% | 2020-09-23 |
| 647. | Dylan (dylan_brenner) | 89.31 | 97% | 2019-05-20 |
| 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 |