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.
| Game | Time | WPM | Accuracy |
|---|---|---|---|
| 17478 | 2019-11-06 03:30:39 | 136.75 | 98% |
| 15090 | 2019-03-23 18:40:09 | 156.92 | 99% |
| 14083 | 2019-03-03 00:42:43 | 132.35 | 97% |
| 12299 | 2019-02-04 16:04:22 | 141.73 | 99% |
| 10003 | 2018-12-31 00:46:58 | 164.00 | 100% |
| 9703 | 2018-12-29 01:43:41 | 141.50 | 99% |
| 6695 | 2018-12-01 00:26:10 | 128.97 | 97% |
| 2614 | 2018-09-21 18:31:54 | 121.87 | 97% |
| 1292 | 2018-09-08 03:15:26 | 133.91 | 99% |