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 |
|---|---|---|---|---|
| 1354. | obama (balduin) | 74.57 | 95% | 2018-04-22 |
| 1355. | Jonathan (panicmanic) | 74.56 | 97% | 2018-08-30 |
| 1356. | Aayush (imqwerty) | 74.55 | 95% | 2019-08-29 |
| 1357. | Vincent (themii154) | 74.51 | 96% | 2020-06-10 |
| 1358. | Shouen (shouenlee) | 74.49 | 95% | 2020-04-14 |
| 1359. | nanda bakana (mutality) | 74.48 | 98% | 2018-01-05 |
| 1360. | BEing VinCI (ppubalo) | 74.47 | 97% | 2019-05-31 |
| 1361. | nuttiez (nuttlatios) | 74.45 | 97% | 2020-11-09 |
| 1362. | Azenpic (azenpic) | 74.44 | 96% | 2017-11-23 |
| 1363. | MacNCheese (macncheeseeeee) | 74.44 | 95% | 2019-06-20 |
| 1364. | Joseph (trickyjogo) | 74.43 | 97% | 2020-11-06 |
| 1365. | Mohammad (casualboo) | 74.41 | 96% | 2019-06-13 |
| 1366. | Ali (bronzor16) | 74.40 | 94% | 2019-09-13 |
| 1367. | account deleted (concurrent) | 74.40 | 95% | 2020-03-15 |
| 1368. | Luke (ltuite) | 74.38 | 95% | 2019-03-12 |
| 1369. | Todd (t0dd1337) | 74.31 | 95% | 2020-08-29 |
| 1370. | Go D. (deeated) | 74.29 | 96% | 2020-11-25 |
| 1371. | Christian (cott8161) | 74.28 | 96% | 2020-01-16 |
| 1372. | ap (nguyen4) | 74.28 | 96% | 2018-06-06 |
| 1373. | Josh (jtreadway) | 74.25 | 96% | 2018-08-14 |
| 1374. | Kyu (kyukang) | 74.21 | 95% | 2018-03-15 |
| 1375. | Grotesque (grotesquevinny) | 74.20 | 95% | 2020-02-15 |
| 1376. | Jake (jakesk) | 74.20 | 96% | 2020-08-24 |
| 1377. | Juan (unbilivavl) | 74.20 | 96% | 2020-08-24 |
| 1378. | Someone (someonetyping) | 74.17 | 98% | 2020-05-21 |
| 1379. | roy (likmyleg) | 74.15 | 97% | 2020-11-06 |
| 1380. | Noah (noah_o_n) | 74.15 | 95% | 2019-01-23 |
| 1381. | Zhivko (zikica97) | 74.12 | 97% | 2019-05-09 |
| 1382. | Sonny (sonson88) | 74.04 | 96% | 2017-10-07 |
| 1383. | Duduk (dudukmete) | 74.03 | 95% | 2019-01-06 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | October 7, 2017 |
| Instant Death Mode | 3 | 99.10 | January 10, 2019 |
| All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
| New English Texts | 1 | 108.31 | May 26, 2022 |