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 |
|---|---|---|---|---|
| 829. | Anthony (carllimcarl) | 84.77 | 95% | 2019-11-02 |
| 830. | Appropriate (d0wny) | 84.75 | 96% | 2019-04-30 |
| 831. | James (james_m808) | 84.74 | 96% | 2020-11-08 |
| 832. | Harry (txharry) | 84.71 | 97% | 2020-11-29 |
| 833. | index finger spacebar user ... | 84.60 | 96% | 2020-07-16 |
| 834. | Rusty (foundry) | 84.58 | 97% | 2019-10-26 |
| 835. | Darryl (eyetoonz) | 84.57 | 97% | 2019-10-13 |
| 836. | Tim (choiyokbao) | 84.56 | 98% | 2020-07-26 |
| 837. | Jon (jonsport) | 84.56 | 97% | 2020-05-03 |
| 838. | Raz (lotanrazlaptop) | 84.53 | 96% | 2020-06-28 |
| 839. | ABC (funnelcake9) | 84.51 | 97% | 2018-12-03 |
| 840. | Novadeluxe (novadeluxe) | 84.50 | 97% | 2018-08-26 |
| 841. | Lakshay (shaybas) | 84.48 | 96% | 2020-05-23 |
| 842. | Jason (jasonbmagat) | 84.47 | 98% | 2019-12-16 |
| 843. | GET SHREKT (overside) | 84.47 | 97% | 2019-02-14 |
| 844. | Zanilen (zanilen) | 84.47 | 97% | 2019-06-10 |
| 845. | Jerome (babayaga36) | 84.43 | 99% | 2020-02-27 |
| 846. | Michael (m_soutar3) | 84.43 | 97% | 2020-06-21 |
| 847. | Miraneir (curiostity) | 84.38 | 96% | 2020-07-23 |
| 848. | Jakob (jakobdont) | 84.35 | 96% | 2020-08-24 |
| 849. | Keyboard (yusong) | 84.34 | 98% | 2018-08-16 |
| 850. | (lwycsrc) | 84.32 | 96% | 2020-04-01 |
| 851. | Steven (szh02) | 84.27 | 96% | 2019-10-18 |
| 852. | A (fdsjaklfdsaj) | 84.26 | 97% | 2020-10-15 |
| 853. | J (jyorange) | 84.24 | 97% | 2018-08-05 |
| 854. | Tung (dungtang) | 84.23 | 96% | 2020-03-25 |
| 855. | ruru (awestrike) | 84.15 | 98% | 2020-05-09 |
| 856. | Alasdair (coolmanic) | 84.13 | 96% | 2020-03-07 |
| 857. | Noah (snugsy) | 84.11 | 97% | 2018-11-27 |
| 858. | Ivan (ichauster) | 84.05 | 95% | 2017-12-07 |
| 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 |