There are so many that it's hard to name just a few (there are 6 geologic time periods that existed before the Triassic after all). A few are dimetrodon, arthropleura, the trilobite, meganeura, gorgonops, and ctenorhachis.
Dinosaurs.
They aren't extict. Birds are dinosaurs.
No it is an adjective, extinction is the noun. Dinosaurs are extinct. The extinction of dinosaurs happened a long time ago.
Dinosaurs
Dinosaurs became extinct millions of years ago. Dinosaurs died off long before humans came into existence.
They were extinct since a long time, most dinosaurs displayed in bones are in historical museums.
Dinosaurs have long been extinct, making it impossible for scientists to work with living dinosaurs.
Because they are extinct a long time ago.
No. Dinosaurs were long extinct when 'caveman' came on the scene.
None - dinosaurs are extinct, and have been for a very long time.
Dinosaurs were extinct long before the telephone was invented. They did not have mobile phones, not even iPhones.
No! Dinosaurs became extinct a long time ago.