Why did so many animals go extinct 10000 years ago?

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Tags

1. #addition
2. #already
3. #pleistocene
4. #extinct
5. #whether
6. #north
7. #unclear
8. #previously
9. #america
10. #percent
11. #during
12. #found
13. #large
14. #species
15. #terminal
16. #because
17. #missing
18. #mammal
19. #years
20. #simply