The Paleozoic Era's periods, from oldest to most recent, are: Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. Of the provided options, the correct sequence is Silurian, Devonian, Carboniferous, and Permian, which maintains the established order.
| List - I | List – II | ||
| A. | Living Fossil | i. | Elongated canine teeth |
| B. | Connecting Link | ii. | Vermiform appendix |
| C. | Vestigial Organ | iii. | Echidna |
| D. | Atavism | iv. | Latimeria |