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 |
|---|---|---|---|---|
| 1378. | Go D. (deeated) | 74.29 | 96% | 2020-11-25 |
| 1379. | ap (nguyen4) | 74.28 | 96% | 2018-06-06 |
| 1380. | Christian (cott8161) | 74.28 | 96% | 2020-01-16 |
| 1381. | Josh (jtreadway) | 74.25 | 96% | 2018-08-14 |
| 1382. | Kyu (kyukang) | 74.21 | 95% | 2018-03-15 |
| 1383. | Grotesque (grotesquevinny) | 74.20 | 95% | 2020-02-15 |
| 1384. | Jake (jakesk) | 74.20 | 96% | 2020-08-24 |
| 1385. | Juan (unbilivavl) | 74.20 | 96% | 2020-08-24 |
| 1386. | Someone (someonetyping) | 74.17 | 98% | 2020-05-21 |
| 1387. | Noah (noah_o_n) | 74.15 | 95% | 2019-01-23 |
| 1388. | roy (likmyleg) | 74.15 | 97% | 2020-11-06 |
| 1389. | Zhivko (zikica97) | 74.12 | 97% | 2019-05-09 |
| 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 |
| 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 |