| Link | Quote | Stars | Tags | Author |
| fa7c167 | To live on land, organisms needed vastly greater amounts of complexity. | Life of Earth | ||
| 706efbb | Ancient bacteria had almost all the kinds of metabolism that we find on Earth today. | Life of Earth | ||
| e951c99 | The meager food web of the Earth became a vibrant one, based on the sugar produced by cyanobacteria. | Life of Earth |