Across
- 3. Any difference between individuals of the same species
- 6. The theory that evolution occurs slowly but steadily
- 7. The gradual change in a species over time.
- 8. A group of similar organisms that can mate and produce fertile offspring.
- 9. The process by which individuals that are better adapted to their environment are more likely to survive is called natural
- 10. The preserved remains of an organism.
Down
- 1. The theory that evolution occurs during short periods of rapid change is punctuated
- 2. A trait that helps an organism survive and reproduce
- 4. A fossil formed when an organism buried in sediment dissolves, leaving a hollow area
- 5. Similar structurs that related species inherited from a common ancestor
- 7. No members of a species are still alive.