Even the Sun has water vapor.

As for oxygen, it is actually poisonous to living things. Earth biology did not start with oxygen metabolism. Devising the necessary biochemistry to safely use it called for around a billion and a half years of evolution, that is more than twice the time vertebrates have existed. Respiration with oxygen liberates more joules of energy per mole than respiration without it, however, which is why pre-oxygen microbes are now a minority and live now mostly underground, in marginal soils or in wounds on vertebrates. Pre-oxygen microbes could never have become multicellular, and oxygen users dominate in biomass and species diversity.

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