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 |
|---|---|---|---|---|
| 391. | napkin (call_me_napkin) | 98.36 | 97% | 2020-10-17 |
| 392. | kiki (aokiki) | 98.34 | 98% | 2019-06-25 |
| 393. | Jay (jay0005) | 98.27 | 97% | 2020-08-25 |
| 394. | Piggy (piggosu) | 98.23 | 99% | 2018-03-13 |
| 395. | polt (poltt) | 98.22 | 97% | 2020-11-19 |
| 396. | Mario (mariotusa) | 98.21 | 100% | 2018-01-05 |
| 397. | Leia (s_leia) | 98.18 | 97% | 2020-12-11 |
| 398. | Alex (wu2481632) | 98.18 | 97% | 2019-01-07 |
| 399. | Comeonn1 (comeonn1) | 98.15 | 98% | 2018-06-09 |
| 400. | 0x507FA88 (tt_richard) | 98.14 | 98% | 2019-02-08 |
| 401. | James (jamesz) | 98.00 | 97% | 2018-07-22 |
| 402. | Alex (gameahn) | 97.92 | 98% | 2017-10-21 |
| 403. | Zhren (zhren) | 97.92 | 96% | 2020-08-29 |
| 404. | Nagromancer (nagromicous) | 97.75 | 98% | 2020-05-11 |
| 405. | Master (mcrockett) | 97.71 | 99% | 2019-02-28 |
| 406. | boruto (boruto_jougan_eye) | 97.56 | 100% | 2018-09-07 |
| 407. | Bob (mortedieu) | 97.50 | 96% | 2020-05-11 |
| 408. | Xin (giorgi1123) | 97.48 | 98% | 2019-02-12 |
| 409. | Alexander (prowlingtiger) | 97.46 | 98% | 2018-08-26 |
| 410. | Jim (pokemontcg2) | 97.32 | 97% | 2018-09-28 |
| 411. | ze_or (ze_or) | 97.31 | 98% | 2020-11-04 |
| 412. | TimeLoad (timeload) | 97.29 | 98% | 2018-02-22 |
| 413. | pong (darrenoyyp95) | 97.12 | 97% | 2020-09-25 |
| 414. | john helldiver (ireallymatt... | 97.10 | 97% | 2020-04-04 |
| 415. | (timjeffery44) | 97.01 | 95.3% | 2025-01-01 |
| 416. | Justin (5eraph) | 96.95 | 99% | 2019-10-23 |
| 417. | ✖-Bows (xbows) | 96.95 | 97% | 2019-04-04 |
| 418. | tstats[kamikrazy] (kamikrazy) | 96.89 | 98% | 2020-09-29 |
| 419. | Linh (chillgame) | 96.84 | 96% | 2018-09-09 |
| 420. | suffering (symbolizm) | 96.81 | 98% | 2018-12-20 |
| 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 |