| Answer | Crossword Clue |
|---|---|
| ICEAGE | When modern elephants first appeared |
| EOCENE | Epoch when modern mammals appeared |
| PALEOZOICERA | When reptiles first appeared |
| EOCENE | Epoch when monkeys first appeared |
| EOCENE | Epoch when bats first appeared |
| EOCENE | Epoch when horses first appeared |
| TRIASSIC | Period when mammals first appeared |
