Across
- 4. trait that increases an organism's ability to survive and reproduce
- 6. The process of change over time
- 8. the scientific study of heredity
- 11. small changes that add up to major changes over a long period of time which species evolve during
- 12. short periods of rapid change in species
- 13. similar structures that related species have inherited from a common ancestor
- 15. is a well-tested concept that explains a wide range of observations.
Down
- 1. the preserved remains or traces of an organism that lived in the past.
- 2. factor that controls a trait
- 3. Any difference between individuals of the same species
- 5. a trait that helps an organism to survive and reproduce.
- 7. the process by which individuals that are better adapted to their environment are more likely to survive and reproduce more than other members of the same species.
- 9. the passing of physical characteristics from parents to offspring.
- 10. a group of similar organisms that can mate with each other and produce fertile offspring.
- 14. different forms of a gene