Across
- 2. total number of species estimated to be on this Earth
- 3. species likely to become extinct
- 7. illegal hunting, fishing, etc.
- 8. span of time when a mass extinction took place
- 10. a living museum of the world's biodiversity
- 13. biggest category of organisms discovered
- 14. refers to the numbers of different species in an area
- 15. chemical that caused bird's eggs to crack
- 17. convention on international trade in endangered species
- 18. one cause of extinction
- 19. species that is declining
Down
- 1. area with high species diversity that is threatened
- 4. area of critical biodiversity
- 5. piece of DNA that codes for a trait
- 6. form of tourism that supports an ecologically unique area
- 9. refers to the different traits within a species
- 11. species critical to an ecosystem
- 12. species that are native to an area
- 16. birds that are endemic to Hawaii
- 20. species that is not native to an area(invasive)