Across
- 2. Structures that have no current function
- 7. Change over time
- 9. Inhabitants of an area
- 12. Formation of new species
- 13. Another way of saying natural selection
- 15. Body parts that have same function but not structure
- 16. Inherited characteristic that increases an organisms chance of survival
- 19. Ability of a trait to be passed down
- 20. Process by which evolution occurs
- 21. Preserved remains of ancient organisms
Down
- 1. Difference in a physical trait
- 3. Diversification of a group of organisms into forms filling different ecological niches
- 4. Pattern of evolution where a species is stable for a long time then rapidly changes
- 5. Use of selective breeding to produce organisms with certain desirable traits
- 6. Structures that are similar but aren't related organisms
- 8. Catastrophic events, mass extinction
- 10. When organisms disappear from Earth
- 11. Occurs when populations are separated by geographic barriers, such as mountains or rivers
- 14. Ongoing geologic change that adds up over time
- 17. Gradual changes from small steps
- 18. Ability of an individual to survive and reproduce in a specific environment