Why did Klingons get ridges?

Related questions

1. How strong is a Klingon?
2. Why did Klingons change appearance?
3. What season does the Dominion war start?
4. Whats the difference between Romulans and Vulcans?
5. How many ships were lost in the Dominion War?
6. Does Voyager return to Earth?
7. What started the Dominion War?
8. Who are the Tzenkethi?
9. Why do Klingons look so different?
10. Does Star Trek Voyager get home?

Tags

1. #treated
2. #ridges
3. #loses
4. #klingons
5. #inherit
6. #forehead
7. #klingon
8. #given
9. #augments
10. #virus
11. #antivirus
12. #children
13. #their
14. #against
15. #phlox
16. #would
17. #effects
18. #mutated
19. #other