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 |
|---|---|---|---|---|
| 1645. | Keith (keithlau) | 68.34 | 96% | 2019-06-01 |
| 1646. | Jacob (racelive) | 68.32 | 97% | 2017-10-18 |
| 1647. | imnotanygood (handicaped) | 68.24 | 96% | 2019-04-23 |
| 1648. | hayden (ryhxo) | 68.24 | 96% | 2019-02-24 |
| 1649. | Stone (compiling) | 68.21 | 95% | 2018-03-22 |
| 1650. | pepper (duoerdc99) | 68.18 | 95% | 2019-05-08 |
| 1651. | Baris (baris3) | 68.16 | 97% | 2017-10-20 |
| 1652. | R (rtleo) | 68.15 | 96% | 2018-02-23 |
| 1653. | Floixman (floixman) | 68.11 | 95% | 2018-12-03 |
| 1654. | Oggers (oggers) | 68.10 | 96% | 2018-01-05 |
| 1655. | workmanLayout (mustelad) | 68.10 | 96% | 2020-06-07 |
| 1656. | Derrel (pakler123) | 68.08 | 95% | 2020-10-12 |
| 1657. | jcm (jan500) | 68.06 | 98% | 2020-05-21 |
| 1658. | Kevin (kevin6ooo) | 68.03 | 94% | 2018-04-17 |
| 1659. | K (lightfalls) | 68.03 | 96% | 2019-06-20 |
| 1660. | Romi (romino) | 68.02 | 98% | 2020-03-31 |
| 1661. | tsapi (tsapi) | 68.01 | 98% | 2019-09-17 |
| 1662. | :) (ironapple) | 67.97 | 94% | 2018-10-22 |
| 1663. | Kevin (kevinmeseeyou) | 67.94 | 98% | 2020-03-08 |
| 1664. | Jason (altaria13) | 67.88 | 95% | 2019-09-28 |
| 1665. | heclord (heclord) | 67.88 | 97% | 2017-10-22 |
| 1666. | Bang (dbgt0008) | 67.79 | 96% | 2018-01-05 |
| 1667. | blast (blastoff15) | 67.78 | 98% | 2019-07-02 |
| 1668. | Fitri (endeavor42) | 67.74 | 97% | 2019-02-24 |
| 1669. | BarbBlackburn (3xx8iycrr3xy... | 67.74 | 97% | 2020-12-16 |
| 1670. | Alec (abahrami) | 67.74 | 97% | 2018-08-04 |
| 1671. | Matt (semimilk) | 67.74 | 95% | 2018-03-27 |
| 1672. | Alexander (anfauglit) | 67.72 | 97% | 2019-10-18 |
| 1673. | ヽ༼ຈل͜ຈ༽ﾉ (sipps) | 67.68 | 94% | 2018-02-21 |
| 1674. | Devin (devinqu) | 67.67 | 97% | 2020-02-02 |
| 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 |