| A | B |
|---|
| Natural Selection | Individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species. |
| Adaptive Radiation | Evolution from a common ancestor, in response to living in a new environment. |
| Divergent Evolution | Evolution from a common ancestor. |
| Convergent Evolution | Unrelated species look alike due to similar environmental pressures. |
| Gradualism | The theory that evolution occurs slowly but steadily. |
| Punctuated Equilibrium | The theory that evolution occurs in spurts followed by long periods of little change. |
| Analogous Structure | Structures that are not made of the same "stuff", but are used for the same job. (bird wing and fly wing) |
| Homologous Structure | Structures that are made of the same "stuff", but are used to do different jobs. (human arm and whale flipper) |
