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Earth's early atmosphere had gases escaping into space, produced through photosynthesis by primitive plants, and released by volcanoes.
Escape into space: Lighter gases like hydrogen and helium escaped due to Earth's gravity. Produced through photosynthesis: Oxygen was produced as a byproduct of photosynthesis by early forms of plant life.Released by volcanoes: Volcanoes released gases such as carbon dioxide, sulfur dioxide, and water vapor into the atmosphere.
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