Why did NASA use pure oxygen?

Related questions

1. Is it good to breathe oxygen?
2. Can humans breathe other than oxygen?
3. Do fishes fart?
4. Does oxygen contain moisture?
5. Can liquid oxygen kill you?
6. Do divers breathe pure oxygen?
7. Can oxygen be by itself?
8. What are 4 physical properties of oxygen?
9. Do we breathe nitrogen?
10. Is oxygen responsible for aging?

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6. #hardware
7. #nitrogen
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10. #apollo
11. #significant
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15. #needed
16. #deliver
17. #plumbing
18. #associated