Clue: About 21% of the atmosphere
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Related Clues:
- Life-supporting gas
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- Vital gas element
- Element, atomic number 8
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- Life supporting element
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- Gas, O
- Colourless, odourless, tasteless non-flammable gas
- O, it's in the tent
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- O, there's less of it up there
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- Roughly 21% of the atmosphere