Is it hard to breathe on Mount Everest?

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Tags

1. #tasks
2. #third
3. #breath
4. #effort
5. #become
6. #require
7. #breathing
8. #pulls
9. #because
10. #oxygen
11. #extra
12. #everest
13. #muscles
14. #requires
15. #increases
16. #atmosphere
17. #physical
18. #harder
19. #tries
20. #level