| arch | considered ancient life forms that evolved separately from bacteria and blue-green algae |
|---|---|
| arch | considered ancient life forms that evolved separately from bacteria and blue-green algae |
| arch | related to or dealing with or devoted to archaeology |
| arch | related to or dealing with or devoted to archaeology |
| arch | an anthropologist who studies prehistoric people and their culture |
| arch | the branch of anthropology that studies prehistoric people and their cultures |
| arch | extinct primitive toothed bird of the Upper Jurassic having a long feathered tail and hollow bones |
| arch | extinct primitive toothed bird of the Upper Jurassic having a long feathered tail and hollow bones |
| arch | extinct primitive toothed bird with a long feathered tail and three free clawed digits on each wing |
| arch | primitive reptile-like fossil birds of the Jurassic or early Cretaceous |
| arch | the time prior to 2,500 million years ago |
| arch | (geology) formed in the earlier of two divisions of the Precambrian era |