Across
- 2. Makes up all of the fossils that have been found on Earth
- 7. When many species die off around the same time
- 9. Passed from parent to offspring via genes
- 10. A species becomes better formed to fit its environment over many years
- 11. To change in response to a change in the environment
- 12. Models the relationships between different lineages and their common ancestors
- 13. Selection the idea that the organisms best formed to fit their environment are more likely to survive
- 15. Ancestral group of organisms that is shared by multiple lineages
- 16. Remains of an organism that lived long ago
- 18. An unusual change in an individual organism
- 19. Features that evolved independently along different lineages but have similar function
Down
- 1. A way to tell how old something is by studying its chemical properties
- 3. Where fossils are usually found
- 4. Animal that is closest related to humans
- 5. Gene differences in a population
- 6. All organisms in a species have died out
- 8. Large organism that lived long ago
- 14. Features resulting from common ancestry
- 17. Physical features of modern organisms