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 |
---|---|---|---|---|
1521. | Ravioli (mhazaz) | 70.81 | 96% | 2020-08-24 |
1522. | K (kevt138) | 70.80 | 96% | 2018-01-05 |
1523. | 𝕋𝕒𝕫𝕫𝕒 (tazza2) | 70.80 | 96% | 2020-06-14 |
1524. | Anssi (nininananunu) | 70.79 | 96% | 2017-12-02 |
1525. | Lance (chunkysoup) | 70.74 | 94% | 2018-11-26 |
1526. | yaha (mastercoolz) | 70.74 | 98% | 2017-11-08 |
1527. | Eloy (swekingeib) | 70.72 | 97% | 2019-09-20 |
1528. | Sanic (192378) | 70.68 | 95% | 2020-12-08 |
1529. | Ish (asdfwhatyouknow) | 70.67 | 96% | 2018-11-29 |
1530. | rohit_india (rohit_typefast) | 70.66 | 98% | 2018-12-01 |
1531. | Santiago (drebexler) | 70.66 | 95% | 2020-10-15 |
1532. | Zoot (chroniaro) | 70.65 | 96% | 2019-04-29 |
1533. | Che (che247) | 70.64 | 96% | 2020-05-06 |
1534. | BAKES (mattattack1223) | 70.64 | 95% | 2018-11-01 |
1535. | Kyozō (thegiantchip) | 70.61 | 95% | 2019-07-17 |
1536. | ng (minhtuhay123) | 70.56 | 97% | 2020-08-05 |
1537. | you (michellechihoatang) | 70.55 | 95% | 2020-05-12 |
1538. | Shoaib Sajid (shoaibsajid) | 70.50 | 97% | 2018-08-17 |
1539. | Ronald (ron777) | 70.50 | 96% | 2018-12-26 |
1540. | David (dazzlethc) | 70.50 | 97% | 2020-03-07 |
1541. | Dmeister (dclott) | 70.50 | 97% | 2019-11-23 |
1542. | sweetyukibo (sweetyukibo) | 70.47 | 97% | 2018-02-02 |
1543. | Beddytear (beddytear) | 70.46 | 96% | 2020-11-19 |
1544. | Ray (ray_maddox) | 70.45 | 95% | 2020-05-19 |
1545. | LEntless (lentless) | 70.42 | 97% | 2017-10-07 |
1546. | Troels (duckzern) | 70.42 | 96% | 2019-09-09 |
1547. | teetoHappy (teetohappy) | 70.37 | 95% | 2020-12-18 |
1548. | The (pseudotypist) | 70.35 | 96% | 2020-11-11 |
1549. | Jennifer (jenniferzed) | 70.32 | 95% | 2017-10-10 |
1550. | slagtherisen (slagtherisen) | 70.27 | 98% | 2018-03-23 |
Universe | Races | Average WPM | First Race |
---|---|---|---|
Default (English) | 2,850 | 89.33 | 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 |