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 |
|---|---|---|---|---|
| 367. | Helen (28promises) | 99.34 | 97% | 2017-10-09 |
| 368. | Tim (timsutton) | 99.29 | 98% | 2017-10-25 |
| 369. | M&W (wmichaelwhitlock) | 99.29 | 98% | 2018-11-07 |
| 370. | Sebastian (boywonder) | 99.25 | 98% | 2018-08-10 |
| 371. | lcrds (m4ck) | 99.24 | 98% | 2020-11-30 |
| 372. | Gary (garyboo) | 99.24 | 98% | 2018-06-07 |
| 373. | Adam (shoelegend88) | 99.23 | 95% | 2018-10-16 |
| 374. | chkhikvanormelia (chkhikvan... | 99.21 | 98% | 2025-09-12 |
| 375. | JeremyLoves (karenismywaifu) | 99.16 | 99% | 2019-05-01 |
| 376. | Moist (moisturemob) | 99.08 | 98% | 2018-03-20 |
| 377. | d (dc37) | 99.03 | 97% | 2017-12-17 |
| 378. | Cowcaine (gingfreecss2) | 99.02 | 98% | 2017-11-05 |
| 379. | Mark (mw126) | 98.98 | 97% | 2020-12-07 |
| 380. | 16/f/cali (ultrashibe) | 98.90 | 95% | 2018-08-11 |
| 381. | tstats[pumpkinsoup1] (pumpk... | 98.84 | 95% | 2020-12-19 |
| 382. | Harvey (sw99) | 98.78 | 98% | 2020-12-09 |
| 383. | Captain Oz (kildoes) | 98.69 | 95% | 2019-07-29 |
| 384. | (jasimk) | 98.67 | 98% | 2022-11-03 |
| 385. | Poops (poops_magee) | 98.60 | 97% | 2020-07-13 |
| 386. | JoX (jox997) | 98.56 | 99% | 2018-05-14 |
| 387. | :) (bavadin) | 98.53 | 97% | 2020-11-22 |
| 388. | Adrian (smithya) | 98.53 | 98% | 2018-06-10 |
| 389. | ratbastard (mattbierwirth) | 98.52 | 98% | 2018-01-06 |
| 390. | Calvin (taintedducky) | 98.39 | 96% | 2020-01-16 |
| 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 |
| 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 |