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- Permian-like Atmosphere (category Paleoecological chemistry)Continuum Universes Hot Oxygen-Rich Biospheric Atmosphere High-Pressure Paleoecological Air System N₂ 72%, O₂ 18%, CO₂ 7%, CH₄ 1%, SO₂ 0.5%, H₂O 1.5% 1.2–1...5 KB (380 words) - 15:59, 17 October 2025