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 |
|---|---|---|---|---|
| 932. | yong (topcool) | 82.50 | 96% | 2018-10-26 |
| 933. | ehj53 (ehj53) | 82.49 | 98% | 2019-08-27 |
| 934. | Scott (scottymcraig) | 82.46 | 97% | 2019-03-25 |
| 935. | gab (ggzl1998) | 82.44 | 97% | 2020-11-15 |
| 936. | o.O (yorickvw) | 82.44 | 96% | 2018-05-14 |
| 937. | Tess (makeleletoulalan) | 82.43 | 97% | 2017-11-01 |
| 938. | Marc (exorbis) | 82.39 | 96% | 2020-03-01 |
| 939. | MooD (xslel) | 82.39 | 97% | 2020-11-17 |
| 940. | Mod (modulatus) | 82.38 | 96% | 2020-11-26 |
| 941. | Zach (morcheeba) | 82.36 | 98% | 2020-01-19 |
| 942. | Norman (dancingcat) | 82.32 | 97% | 2018-01-15 |
| 943. | Demancer (demancer) | 82.32 | 98% | 2019-02-21 |
| 944. | Alex (eggstreme) | 82.31 | 96% | 2019-06-18 |
| 945. | Filip (filip26) | 82.29 | 96% | 2020-06-25 |
| 946. | Bobbatron (bobbatron808) | 82.23 | 97% | 2018-02-17 |
| 947. | Cluody132 (cluody132) | 82.22 | 97% | 2017-12-14 |
| 948. | s. (capslooock) | 82.21 | 96% | 2019-02-16 |
| 949. | crisol (goryubuster) | 82.20 | 95% | 2019-10-04 |
| 950. | k (kb2005) | 82.18 | 99% | 2020-08-27 |
| 951. | Vandrick (vandrick) | 82.18 | 97% | 2017-10-26 |
| 952. | Will (shadzalt) | 82.17 | 97% | 2020-04-10 |
| 953. | Raalylen (raalylen) | 82.16 | 97% | 2020-07-31 |
| 954. | Panda! at the Disco (chardb... | 82.16 | 97% | 2020-02-01 |
| 955. | tirehtööri (benracer) | 82.14 | 97% | 2020-07-10 |
| 956. | GiftedOtter (giftedotter) | 82.11 | 98% | 2018-10-29 |
| 957. | Aaron (adodd81802) | 82.09 | 96% | 2019-01-29 |
| 958. | gg (ggab) | 82.06 | 97% | 2018-09-20 |
| 959. | Jack (jr9810) | 82.05 | 97% | 2018-08-09 |
| 960. | JJSky (jjsky) | 82.04 | 97% | 2020-03-16 |
| 961. | Ronald (primarch) | 82.02 | 98% | 2019-07-21 |
| 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 |