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Evoluntion
| Species | group of organisms |
| Evolution | Changes that occur over time |
| Natural selection | Darwin’s theory of evolution |
| Variation | The occurrence of an inherited trait |
| Fossil | Remains of life |
| Relative dating | Estimating the age of a fossil by comparing it to younger fossils |
| Homologous | Body parts in different species |
| Vestigial structures | A body part that is reduced in size |
| Embryology | The study of the development of embryos |
| Homo sapiens | Our own species |
| Extinction | dying out of an entire species. |
| Endangered species | species with so few individuals left |