Across
- 1. / A group of similar organisms that can mate with eachother and produce fertile offspring
- 3. / The theory that evolution occurs slowly but steadily
- 5. Dating / A technique used to determinewhich of two fossils is older
- 7. / Any difference between individuals of the same species.
- 8. 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
- 9. Theory / a well-tested concept that explains a wide range of observations
- 11. Tree / A diagram that shows how scientists think different groups of organisms are related
- 13. Structures / Body parts that are structurally similar in related species; provide evidence that the structures were inherited from a common ancestor
- 14. / The gradual change of species over time
Down
- 2. Equilibria / The theory that species evolve during short periods of rapid change
- 4. / A trait that helps an organism survive and reproduce
- 6. Dating / A technique used to determine the actual age of the fossil
- 10. / The study of the early stages of growth and development
- 12. / The preserved remains or traces of an organism that lived in the past