Evolutionary History

2. the process by which one population evolves into two or more different species
3. to classify based on scientific examination
8. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
10. a trait that makes it more likely that an individual will survive in a specific environment bodystructure a part of an organism (for example, one or more bones)common
11. a scientist who studies fossils in order to understand the ancient history of life on Earth
13. having died out completely and no longer alive anywhere on Earth
15. the very long time that spans the history of Earth, from the very first cellular life to the present
17. everything (living and nonliving) that surrounds an organism
18. when something stays mostly the same over time

1. an older population from which two or more newer species descended
4. a related organism from a previous generation
5. sharing a common ancestor population
6. the process by which species adapt to environmental changes over a very long time
7. a group of individuals born and living at about the same time
9. structure a body structure in two or more species that features the same parts (for example, the same bones)
12. a specific characteristic of an individual organism
14. a more recent species that evolved from an ancestor population
16. a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group