Across
- 5. Information about past life, including the structure of organisms, what they ate, what ate them, in what environment they lived, and the order in which they lived
- 7. A term that typically describes a species that no longer has any known living individuals.
- 9. Happens on a scale that transcends the boundaries of a single species
- 12. The gradual change in a species over time
- 13. Scale used by paleontologists to represent evolutionary time
- 14. A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits.
- 15. Structures in different species that are similar because of common ancestry.
- 16. A well-tested explanation for a wide range of observations or experimental results.
Down
- 1. The preserved remains or traces of an organism that lived in the past
- 2. A family tree that shows the evolutionary relationships thought to exist among groups of organisms
- 3. Any difference between individuals of the same species.
- 4. A technique used to determine the actual age of a fossil on the basis of the amount of a radioactive element it contains
- 6. A trait that helps an organism survive and reproduce
- 8. English natural scientist who formulated a theory of evolution by natural selection (1809-1882)
- 10. Method of determining the age of a fossil by comparing its placement with that of fossils in other layers of rock
- 11. Happens on a small scale (within a single population).