Evolutionary History

2. a body structure in two or more species that features the same parts (for example, the same bones)
4. a group of individuals born and living at about the same time
5. an older population from which two or more newer species descended
6. a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group
9. having died out completely and no longer alive anywhere on Earth
10. a part of an organism (for example, one or more bones)
13. when something stays mostly the same over time
15. a group of the same type of organism living in the same area

1. a more recent species that evolved from an ancestor population
3. a related organism from a previous generation
7. the process by which one population evolves into two or more different species
8. a scientist who studies fossils in order to understand the ancient history of life on Earth
11. the process by which species adapt to environmental changes over a very long time
12. a specific characteristic of an individual organism
14. evidence of life from the past, such as fossilized bones, footprints, or leaf prints