"Anywhere there’s oxygen you’re sure to find trees."
Daniel Jackson[src]

Oxygen is a gas that is abundant on just about every inhabitable planet. Humans require oxygen, as well as a mixture of nitrogen, to survive. (SG1: "Revisions")

It would seem that sulfur-based lifeforms such as the Gadmeer do not require oxygen as they were terraforming a planet to make it suitable for them to live on. (SG1: "Scorched Earth")

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