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 |
|---|---|---|---|---|
| 1349. | Azenpic (azenpic) | 74.44 | 96% | 2017-11-23 |
| 1350. | MacNCheese (macncheeseeeee) | 74.44 | 95% | 2019-06-20 |
| 1351. | Joseph (trickyjogo) | 74.43 | 97% | 2020-11-06 |
| 1352. | Mohammad (casualboo) | 74.41 | 96% | 2019-06-13 |
| 1353. | Ali (bronzor16) | 74.40 | 94% | 2019-09-13 |
| 1354. | left to build something gre... | 74.40 | 95% | 2020-03-15 |
| 1355. | Luke (ltuite) | 74.38 | 95% | 2019-03-12 |
| 1356. | Todd (t0dd1337) | 74.31 | 95% | 2020-08-29 |
| 1357. | Go D. (deeated) | 74.29 | 96% | 2020-11-25 |
| 1358. | Christian (cott8161) | 74.28 | 96% | 2020-01-16 |
| 1359. | ap (nguyen4) | 74.28 | 96% | 2018-06-06 |
| 1360. | Josh (jtreadway) | 74.25 | 96% | 2018-08-14 |
| 1361. | Kyu (kyukang) | 74.21 | 95% | 2018-03-15 |
| 1362. | Grotesque (grotesquevinny) | 74.20 | 95% | 2020-02-15 |
| 1363. | Jake (jakesk) | 74.20 | 96% | 2020-08-24 |
| 1364. | Juan (unbilivavl) | 74.20 | 96% | 2020-08-24 |
| 1365. | Someone (someonetyping) | 74.17 | 98% | 2020-05-21 |
| 1366. | roy (likmyleg) | 74.15 | 97% | 2020-11-06 |
| 1367. | Noah (noah_o_n) | 74.15 | 95% | 2019-01-23 |
| 1368. | Zhivko (zikica97) | 74.12 | 97% | 2019-05-09 |
| 1369. | Sonny (sonson88) | 74.04 | 96% | 2017-10-07 |
| 1370. | Duduk (dudukmete) | 74.03 | 95% | 2019-01-06 |
| 1371. | FromtonRouge (fromtonrouge) | 74.01 | 98% | 2018-01-14 |
| 1372. | (4lsi3w544lwi4lk) | 73.98 | 96% | 2020-11-15 |
| 1373. | clerk (csmith2) | 73.95 | 97% | 2018-09-01 |
| 1374. | Neel (neel19) | 73.93 | 96% | 2020-08-08 |
| 1375. | Annie (anniexu) | 73.89 | 95% | 2019-02-12 |
| 1376. | Eiv (mechiguy) | 73.89 | 99% | 2019-06-16 |
| 1377. | sonderr (battery_sr) | 73.89 | 95% | 2019-11-06 |
| 1378. | Shawn (filipinofriend) | 73.88 | 96% | 2019-08-11 |
| 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 |