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 |
|---|---|---|---|---|
| 1128. | Sam (sam889) | 78.63 | 97% | 2019-06-23 |
| 1129. | John (typist426) | 78.63 | 98% | 2017-11-30 |
| 1130. | 230V A/C Single Phase (obidi) | 78.59 | 97% | 2019-11-24 |
| 1131. | Paolo (invelt) | 78.57 | 95% | 2019-10-02 |
| 1132. | AdilDSW (adildsw) | 78.57 | 97% | 2017-11-27 |
| 1133. | Jose (josethomas) | 78.54 | 99% | 2019-06-14 |
| 1134. | Daryl (t3kk3rs) | 78.54 | 96% | 2020-01-13 |
| 1135. | Ed (pelly1863) | 78.52 | 97% | 2018-01-11 |
| 1136. | Johnny (boneritis) | 78.50 | 99% | 2018-09-27 |
| 1137. | Lucario387 (tung1x45) | 78.47 | 94% | 2019-06-09 |
| 1138. | galei (galei) | 78.44 | 97% | 2020-08-14 |
| 1139. | Marc (truthdoc) | 78.44 | 96% | 2017-10-23 |
| 1140. | Joshua (jefry1217) | 78.44 | 97% | 2018-12-30 |
| 1141. | Pan (onepan) | 78.41 | 96% | 2019-10-29 |
| 1142. | ⁹⁻¹⁰ᵍᵐ (green910) | 78.39 | 98% | 2020-08-18 |
| 1143. | Toby (roastpotatoes) | 78.37 | 96% | 2020-07-19 |
| 1144. | Tabs (aptex) | 78.35 | 97% | 2018-02-07 |
| 1145. | Mr. (stealthykoalaber) | 78.35 | 95% | 2019-10-18 |
| 1146. | Ricky (rcheungwtf) | 78.35 | 97% | 2018-03-15 |
| 1147. | Skyler (hausky) | 78.31 | 96% | 2018-11-10 |
| 1148. | Flash (nightburst) | 78.30 | 99% | 2020-03-25 |
| 1149. | John Paul (jpasensi) | 78.30 | 96% | 2020-10-07 |
| 1150. | Max Verstappen (algebromaths) | 78.29 | 97% | 2020-08-06 |
| 1151. | tstats[sinkingecstasies] (s... | 78.27 | 97% | 2020-11-29 |
| 1152. | このむ (konomu) | 78.26 | 96% | 2019-12-23 |
| 1153. | Denny (shizkr) | 78.23 | 99% | 2020-12-08 |
| 1154. | LockStock (lockstock) | 78.22 | 98% | 2018-10-18 |
| 1155. | abcd (4568493) | 78.22 | 96% | 2018-05-20 |
| 1156. | Peter (peternotpiper) | 78.21 | 96% | 2018-10-23 |
| 1157. | MrVestacus (mrvestacus) | 78.19 | 96% | 2019-09-29 |
| 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 |