Across
- 5. An ancestor and all its descendants
- 7. Adapting to look like another species
- 10. Other than the environment, ____ can also cause selection
- 11. When two species evolve closely with each other
- 13. When a species no longer exists it is:
- 14. Evolution between species or higher taxonomic levels is ____evolution
Down
- 1. the eggs or chicks a bird has at one time
- 2. Needed for natural selection
- 3. Evolution within populations is ____evolution
- 4. When the same resources are needed
- 6. A trait that makes an organism more fit for their environment
- 8. When new species are formed
- 9. A species that hurts another species' fitness by increasing their own
- 12. The dinosaur ancestors of birds