Across
- 1. ability to survive to reproductive age
- 6. genetic variation moving between populations
- 7. any difference genetically between organisms
- 11. organisms developing over time
- 12. structures having similar or corresponding functions
- 13. species become isolated on land to prevent gene flow
- 15. fossil useful for dating data
- 16. structures that suggest a common ancestor
- 18. adjustments or changes in behavior
- 19. complete disappearance of a species
- 20. one organisms lives inside another
Down
- 2. preference for characteristics in mating
- 3. change within a species over a short period
- 4. isolated in time, preventing gene flow
- 5. intermediate values are preferred over extreme
- 8. accumulation of differences within the same species
- 9. traits benefit an organisms chance of survival
- 10. extreme values are preferred over intermediate
- 14. independent evolution within a species
- 17. formation of new species from evolution