Across
- 2. The process of organisms with desired traits mating to have more of those traits in the new generation.
- 9. Individuals will survive because they are more fit in their environment.
- 12. The selection by nature where the most fit of a species will live and reproduce.
- 13. Where over the course of many generations species will change to help them survive better in their environment.
- 14. A structure that is reduced in size and has little or no function.
- 15. A theory that evolution happens slowly
Down
- 1. A technique scientists use to find out which fossil is older by looking at their rock layers.
- 3. Body parts that are structurally similar in related species and that provide evidence for a common ancestor
- 4. A technique used to find out which fossil is older based on what rock layer it was found in.
- 5. An idea that over time species evolve into different species.
- 6. The theory that species evolve during short periods of rapid change.
- 7. Differences in a species.
- 8. A diagram that shows how scientists think different groups of organisms are related.
- 10. When all of a species dies out.
- 11. The millions of fossils that scientists have collected, newer fossils are on top and older are on the bottom.