| 1. | Carl Correns | 2. | Charles Lyell |
| 3. | Thomas Malthus | 4. | A. R. Wallace |
| 1. | continuous variations | 2. | mutations |
| 3. | genetic drift | 4. | genetic death |
Given below is the representative evolutionary history of vertebrates through geological periods. A, B, C, and D, respectively, are:
| 1. | Dinosaurs, Thecodonts, Therapsids, and Pelycousurs |
| 2. | Dinosaurs, Therapsids, Thecodonts, and Pelycosaurs |
| 3. | Pelycosaurs, Therapsids, Thecodonts, and Dinosaurs |
| 4. | Theraosids, Dinosaurs, Pelycosaurs, and Thecodonts |