| Answer | Crossword Clue |
|---|---|
| TRIASSIC | Period when dinosaurs appeared |
| TRIASSIC | Period in which dinosaurs appeared |
| MESOZOIC | Geologic era when plants and dinosaurs appeared |
| JURASSIC | Period when dinosaurs lived |
| TRIASSIC | Period when mammals first appeared |
| JURASSIC | Period when birds and mammals appeared |
