What are the three categories of threatened species?

Related questions

1. What Red Data Book contains?
2. What is the IUCN International Union for Conservation of Nature Red List?
3. Why did IUCN prepare the Red Data Book?
4. How many species went extinct since 2000?
5. Is white rhino extinct 2018?
6. Why are giraffes going extinct 2018?
7. Why does IUCN prepare red data book?
8. Did the last male rhino die?
9. What is Red Data Book explain?
10. What does IUCN Red List stand for?

Tags

1. #union
2. #animals
3. #group
4. #plants
5. #species
6. #become
7. #including
8. #experts
9. #danger
10. #vulnerable
11. #fungi
12. #groups
13. #extinct
14. #might
15. #world
16. #which
17. #three
18. #threatened
19. #conservation