Across
- 6. gradual evolution over a long period of time
- 11. change in genes
- 13. body part that evolved through natural selection
- 15. concept of species adapting over time
- 16. gene ____ is what genes do to appear in new environments
- 17. body part that is no longer useful
- 18. species becoming new species
Down
- 1. punctuated ____ is evolution that occurs very quickly
- 2. genetic ____ is the change in species over time
- 3. ____ selection causes adaptations over time
- 4. biology mixed with geography
- 5. directional, stabilizing, and disruptive ___
- 7. ____ ancestors are shared between species
- 8. species trait changing to environment
- 9. concept of evolution through ancestry
- 10. effectiveness in environment
- 12. body part that evolved from ancestors
- 14. a population shrinking after a natural disaster