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Evolution
| Species | Is a unit representing a group of organisms. |
| Evolution | Is the change in the inheritable characteristics. |
| Fossil | Is any preserved remain of an organism. |
| Adaptation | Is when population becomes better suited to its habitat. |
| Scientific theory | Is an explanation of natural phenomena. |
| Natural selection | Is evolution where organisms better adapted to their environment. |
| Competition | Is an interaction between organisms. |
| Sexual selection | Is a natural selection where people with certain traits are more successful. |
| Coevolution | Is where two or more species affect each other's evolution. |
| Fossil record | Is the chronological collection of all discovered fossils. |
| Embryo | Is the earliest stage of development in a multicellular organism. |
| Homologous structures | Is physical features in different organisms. |
| Extinct | Is the permanent disappearance of a species. |
| Vestigial organs | Is a genetically determined anatomical structure. |
| Molecular clock | Is to estimate the timing of evolutionary events. |
| Relative dating | Is the chronological order of past events, fossils, or rock layers. |
| Absolute dating | Determines the specific age in years. |