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 |
|---|---|---|---|---|
| 710. | Adam (bsplit) | 87.30 | 98% | 2020-08-08 |
| 711. | ryan (anonymousboy321) | 87.29 | 95% | 2020-11-19 |
| 712. | Darko (darkec) | 87.27 | 97% | 2020-06-12 |
| 713. | triplealpha (knytehawke) | 87.27 | 97% | 2018-06-13 |
| 714. | K (ainestion) | 87.23 | 96% | 2019-12-02 |
| 715. | Sian Caleb (promechanics) | 87.22 | 98% | 2020-01-11 |
| 716. | Victor (susavile) | 87.21 | 98% | 2020-02-10 |
| 717. | (zesty11) | 87.19 | 96% | 2022-12-09 |
| 718. | Flip (flip2theleft) | 87.18 | 96% | 2020-05-10 |
| 719. | Itaxim (arconn_) | 87.18 | 96% | 2019-10-02 |
| 720. | (scaphism) | 87.17 | 93% | 2019-11-29 |
| 721. | kane (kanekane) | 87.11 | 96% | 2020-11-07 |
| 722. | Person (improbhighnotgonnalie) | 87.09 | 97% | 2020-08-18 |
| 723. | SelfPowered (nawid113) | 87.07 | 98% | 2018-08-18 |
| 724. | Kevin (hellokev) | 87.03 | 95% | 2020-04-14 |
| 725. | Jon (ace4896) | 87.01 | 96% | 2020-09-14 |
| 726. | Deniz (usrbin) | 86.98 | 96% | 2018-05-24 |
| 727. | Tull (torfindel) | 86.98 | 96% | 2017-12-01 |
| 728. | Frank (theoneandonly0485) | 86.95 | 97% | 2020-11-21 |
| 729. | poem ⛈️ (storm) | 86.95 | 95.9% | 2019-07-29 |
| 730. | Djaenk (djaenk) | 86.93 | 97% | 2020-06-15 |
| 731. | Gang (gangganggang11) | 86.93 | 96% | 2019-12-12 |
| 732. | nini (niniwang38) | 86.91 | 98% | 2020-02-01 |
| 733. | Ilia (isilisi) | 86.78 | 97% | 2018-06-22 |
| 734. | Luke (povman) | 86.78 | 98% | 2019-07-16 |
| 735. | Douglas (krakeneggs) | 86.76 | 96% | 2017-11-05 |
| 736. | brrrrrrrrr (kagami_taiga) | 86.75 | 97% | 2018-04-21 |
| 737. | bing (fatfuk) | 86.74 | 95% | 2018-08-25 |
| 738. | Capt Holt (ephenssta) | 86.69 | 97% | 2018-05-28 |
| 739. | Rohit Singh (himynameisrohi... | 86.67 | 96% | 2019-02-09 |
| 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 |