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 |
|---|---|---|---|---|
| 123. | andy (andytixn) | 114.87 | 97% | 2020-06-27 |
| 124. | Christian (krisco) | 114.50 | 99% | 2018-12-06 |
| 125. | Streender (streender) | 114.50 | 97% | 2020-01-02 |
| 126. | snails (hovermind) | 114.22 | 99% | 2020-06-12 |
| 127. | Aaron (aaronadams1) | 114.20 | 99% | 2018-08-24 |
| 128. | Mia (lkortebe) | 114.01 | 98% | 2019-01-24 |
| 129. | x (mxlxdx) | 113.87 | 99% | 2019-04-30 |
| 130. | Eli (eli_ayase) | 113.86 | 96% | 2020-11-04 |
| 131. | Ahmad (slayman19) | 113.80 | 97% | 2020-03-14 |
| 132. | Rude (rudedawg) | 113.77 | 98% | 2019-09-17 |
| 133. | Kelo (xkelo) | 113.75 | 97% | 2019-08-07 |
| 134. | Hi (excetra) | 113.58 | 96% | 2020-01-11 |
| 135. | (jlachney) | 113.48 | 98% | 2018-02-09 |
| 136. | Benji (bmhowie2011) | 113.39 | 98% | 2018-07-22 |
| 137. | pangea (pangeacake) | 113.37 | 98% | 2018-12-06 |
| 138. | Dylan (dr_gammaray) | 113.28 | 98% | 2019-10-31 |
| 139. | dva main (thedragonemperor) | 113.25 | 97% | 2020-12-11 |
| 140. | Kevin (ashret) | 113.25 | 98% | 2019-04-15 |
| 141. | Hailey (haileymeng) | 112.52 | 98% | 2019-01-07 |
| 142. | Pakalu (transfusion) | 112.48 | 98% | 2020-09-02 |
| 143. | Sam (samowens) | 112.44 | 97% | 2018-12-01 |
| 144. | Alfredo 🎉 (zalfredo) | 112.42 | 99% | 2018-06-16 |
| 145. | Romo (drytoast) | 112.29 | 99% | 2020-01-04 |
| 146. | ✔️▄◘🚀!new_luca@y... | 112.22 | 99% | 2020-09-20 |
| 147. | Veklion (veklion) | 112.05 | 98% | 2020-02-15 |
| 148. | ⭐️⭐️⭐️ (pbnl2) | 111.93 | 99% | 2020-01-10 |
| 149. | Zach (zachattack973) | 111.91 | 98% | 2020-02-11 |
| 150. | marvin (magnimarve) | 111.81 | 97% | 2018-10-13 |
| 151. | KC (__kc__) | 111.79 | 99% | 2019-02-04 |
| 152. | akelok (akelok) | 111.70 | 97% | 2019-07-12 |
| 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 |