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 |
|---|---|---|---|---|
| 1518. | Peter (peterruse) | 71.32 | 97% | 2020-10-16 |
| 1519. | James (karonar) | 71.31 | 97% | 2018-12-10 |
| 1520. | Joshua (pigdog435) | 71.24 | 97% | 2018-08-01 |
| 1521. | xena (scogx3281) | 71.24 | 95% | 2020-02-03 |
| 1522. | TTtie (tttie) | 71.22 | 96% | 2020-06-26 |
| 1523. | Nichole (nboise) | 71.21 | 96% | 2020-05-05 |
| 1524. | Ali (ali024) | 71.19 | 96% | 2018-03-29 |
| 1525. | Justin (minionace) | 71.14 | 95% | 2018-02-05 |
| 1526. | Jared (infamousjj) | 71.09 | 94% | 2018-02-21 |
| 1527. | Rob (robear72) | 71.08 | 96% | 2019-08-15 |
| 1528. | Andy (kwoktopus) | 71.08 | 98% | 2020-11-02 |
| 1529. | Mark (phoenixxix) | 71.06 | 94% | 2019-06-03 |
| 1530. | Said (surrenderordie) | 71.05 | 98% | 2020-07-23 |
| 1531. | Ben (bacco) | 71.05 | 97% | 2018-02-08 |
| 1532. | d0ge (d0ge) | 71.03 | 96% | 2019-03-25 |
| 1533. | Austin (goodrichinator) | 71.01 | 96% | 2020-10-16 |
| 1534. | gzip1 (gzip1) | 71.00 | 97% | 2019-10-11 |
| 1535. | Andrej (apalias) | 70.97 | 97% | 2020-09-11 |
| 1536. | Justin (ohshitbye) | 70.96 | 97% | 2020-07-11 |
| 1537. | DangdutKoplo (dangdutkoplo2) | 70.91 | 96% | 2019-04-14 |
| 1538. | Yzmael (yzmael156) | 70.89 | 97% | 2019-03-06 |
| 1539. | Grand Magus (aimtiaz20) | 70.87 | 97% | 2019-05-23 |
| 1540. | Bianca Juliene (biancajuliene) | 70.87 | 95% | 2020-08-14 |
| 1541. | SinglePaper (singlepaper) | 70.84 | 95% | 2020-09-28 |
| 1542. | Michwael Redpants (endlessm... | 70.83 | 98% | 2019-09-03 |
| 1543. | LightningMcQueen (yeezyyeezy) | 70.83 | 96% | 2017-11-22 |
| 1544. | Ravioli (mhazaz) | 70.81 | 96% | 2020-08-24 |
| 1545. | K (kevt138) | 70.80 | 96% | 2018-01-05 |
| 1546. | 𝕋𝕒𝕫𝕫𝕒 (tazza2) | 70.80 | 96% | 2020-06-14 |
| 1547. | Anssi (nininananunu) | 70.79 | 96% | 2017-12-02 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Default (English) | 2,929 | 89.24 | October 7, 2017 |
| Instant Death Mode | 3 | 99.10 | January 10, 2019 |
| All TypeRacer Texts | 1 | 76.47 | February 24, 2022 |
| New English Texts | 1 | 108.31 | May 26, 2022 |