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 |
|---|---|---|---|---|
| 1791. | Isak (isapan) | 62.63 | 96% | 2019-11-29 |
| 1792. | Anmol (anmolsaraswat) | 62.62 | 95% | 2018-04-19 |
| 1793. | Mark (bossnyeeesssman) | 62.61 | 96% | 2018-11-23 |
| 1794. | Gage (guywholikesdoors) | 62.37 | 95% | 2020-12-07 |
| 1795. | Guest (crankertanker) | 62.24 | 96% | 2020-08-24 |
| 1796. | Janis (vigilante434) | 62.23 | 97% | 2019-03-16 |
| 1797. | Glennis (biotic_god) | 62.20 | 93% | 2019-01-08 |
| 1798. | Jack (lil_nut_juice4) | 62.20 | 95% | 2018-12-19 |
| 1799. | Taha (yohohoy) | 62.14 | 96% | 2020-02-22 |
| 1800. | amin (parich) | 62.11 | 96% | 2020-03-07 |
| 1801. | Zicheng (bin_laggin) | 62.06 | 96% | 2019-04-16 |
| 1802. | Panic (panicswitch07) | 61.94 | 95% | 2019-07-26 |
| 1803. | Yoshi (justayoshi) | 61.93 | 96% | 2020-09-06 |
| 1804. | lemty (lemty) | 61.91 | 97% | 2019-02-28 |
| 1805. | mhee (hangzoon) | 61.89 | 94% | 2018-02-12 |
| 1806. | sarai (yuki3721) | 61.86 | 96% | 2020-07-31 |
| 1807. | mcshizney (mcshizney) | 61.83 | 97% | 2018-06-20 |
| 1808. | You (checkicus) | 61.83 | 98% | 2020-06-05 |
| 1809. | simen (weeooweeoo) | 61.72 | 98% | 2017-12-28 |
| 1810. | Noah (noahzilla) | 61.67 | 95% | 2020-10-29 |
| 1811. | MemeDude (memegod01) | 61.63 | 97% | 2017-10-17 |
| 1812. | suppakit (oloxbangxolo) | 61.61 | 94% | 2019-01-19 |
| 1813. | KillTheNoise - KSA (missile... | 61.57 | 96% | 2018-08-17 |
| 1814. | Theodor (chocorolls) | 61.51 | 95% | 2019-07-26 |
| 1815. | supernoob (krcellucci) | 61.50 | 96% | 2020-08-21 |
| 1816. | Tobtoby (tobtoby) | 61.49 | 94% | 2020-12-20 |
| 1817. | Luke (lukeleblanc15) | 61.47 | 97% | 2020-07-06 |
| 1818. | Manraj (man_123lama) | 61.36 | 96% | 2019-07-26 |
| 1819. | EJ (clarencedc) | 61.23 | 96% | 2020-11-10 |
| 1820. | TSpin (all_type) | 61.13 | 95% | 2019-08-29 |
| 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 |