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 |
|---|---|---|---|---|
| 1390. | Sonny (sonson88) | 74.04 | 96% | 2017-10-07 |
| 1391. | Duduk (dudukmete) | 74.03 | 95% | 2019-01-06 |
| 1392. | FromtonRouge (fromtonrouge) | 74.01 | 98% | 2018-01-14 |
| 1393. | (4lsi3w544lwi4lk) | 73.98 | 96% | 2020-11-15 |
| 1394. | clerk (csmith2) | 73.95 | 97% | 2018-09-01 |
| 1395. | Neel (neel19) | 73.93 | 96% | 2020-08-08 |
| 1396. | Annie (anniexu) | 73.89 | 95% | 2019-02-12 |
| 1397. | Eiv (mechiguy) | 73.89 | 99% | 2019-06-16 |
| 1398. | sonderr (battery_sr) | 73.89 | 95% | 2019-11-06 |
| 1399. | Shawn (filipinofriend) | 73.88 | 96% | 2019-08-11 |
| 1400. | Matthew (matthew243342) | 73.86 | 95% | 2018-10-25 |
| 1401. | Emil (emle10) | 73.84 | 95% | 2020-07-25 |
| 1402. | keni (kenibot) | 73.81 | 95% | 2020-09-07 |
| 1403. | sheep (theonesheep) | 73.80 | 97% | 2020-08-29 |
| 1404. | Jason (bigswass) | 73.80 | 96% | 2018-12-20 |
| 1405. | Duy (fooom) | 73.80 | 96% | 2019-10-20 |
| 1406. | Leon (bluesunset) | 73.76 | 98% | 2017-10-23 |
| 1407. | egnaro (egnaro315) | 73.76 | 97% | 2019-06-26 |
| 1408. | Edward (kailhreds) | 73.74 | 97% | 2019-04-01 |
| 1409. | Igor (skeef79) | 73.66 | 96% | 2020-11-18 |
| 1410. | HiddenRoom (hiddenroom404) | 73.64 | 99% | 2019-05-30 |
| 1411. | Taylor (taylorcuber717) | 73.61 | 96% | 2020-05-17 |
| 1412. | (6kg_rat) | 73.60 | 96.2% | 2025-06-04 |
| 1413. | Mike (unforgotten) | 73.57 | 96% | 2019-04-27 |
| 1414. | Tito (titobadangpogi) | 73.54 | 95% | 2020-03-25 |
| 1415. | Abhisek (_typing_) | 73.51 | 98% | 2020-12-16 |
| 1416. | idell (notidell) | 73.44 | 97% | 2020-10-03 |
| 1417. | Phil (pliao39) | 73.41 | 97% | 2020-11-15 |
| 1418. | (based) (not_medicine) | 73.35 | 97% | 2018-12-20 |
| 1419. | Kumar (kumar_thapa1) | 73.32 | 97% | 2019-12-31 |
| 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 |