| While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal species, and some were able to shift between these stances. |
| However, the genes may be evolutionarily related, and the two developmental pathways may therefore have ancestrally shared common components. |
| The United States represents the future, but a future that is connected, ancestrally, to the past and to Great Britain. |
| American paleontologist who popularized the theory that many species of dinosaurs were warm-blooded and ancestrally linked to birds. |
| Until we rooted the eukaryote tree correctly it was harder to decide whether such features absent in some groups were ancestrally absent or secondarily lost. |
| Lower back pain is likely because we are ancestrally quadrapedal animals turned into bipeds and this is giving us problems. |
