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New page: Oxygen is a chemical element vital for life. Under normal conditions it is a colorless odorless gas consisting of two oxygen atoms which has the chemical formula O2. Approxima...
Oxygen is a chemical [[element]] vital for life. Under normal conditions it is a colorless odorless [[gas]] consisting of two oxygen [[atom]]s which has the chemical formula O2.
Approximately 20% of the [[atmosphere]] is made up of oxygen.
Approximately 20% of the [[atmosphere]] is made up of oxygen.