| There are two main types, the dome heads and the horned dinosaurs, which evolved from a common ancestor during the early Cretaceous. |
| They argued that the simplest interpretation of this gap was a single-insertion event in a common ancestor shared solely by animals and fungi. |
| It is generally accepted that all multicellular animals have evolved from a common ancestor, which itself evolved from a single-celled organism. |
| It seems likely that the common ancestor of all three modern families was some kind of amphibious hyracoid. |
| But understanding of how these beetles live, and how they evolved from a common ancestor, makes them less mysterious. |
| Fossil records show that millions of years ago, cows and pigs shared a common ancestor, an animal that looked more pig than cow. |
