evolution vocab

4. structures: anatomical structures that have closely related functions but don't derive from the same ancestral structure
6. equilibria: the theory that species evolve during short periods of rapid change
8. the theory that evolution occurs slowly but steadily.
10. the gradual change in a species over time
12. a group of similar organisms that can mate with each other and produce fertile offspring
13. structures: structures that seen to serve no function but resemble structures with functionall roles in related organisms
14. tree: a diagram that shows how scientists think different groups of organisms are related

1. any difference between individuals of the same species
2. selection: the process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species
3. a trait that helps an organism survive and reproduce
5. the study of body structure of organisms
7. theory: a well tested concept that explains a wide range of observations
9. structures: anatomical structures that occur in different species and that originated by heredity from a structure in the most recent common ancestor of the species
11. a species that does not have any living members