Across
- 2. primary consumers
- 4. a relationship in which two or more species benefit
- 7. a physically close relationship in which at least one organism benefits
- 9. the ability to survive and reproduce under changing environmental conditions
- 10. change over time
Down
- 1. series of ecological changes over time
- 3. the disappearance of a species
- 5. the process by which one species hunts and kills another
- 6. a heritable trait that increases individual fitness
- 8. the process by which new species are generated