Last Updated：2025/11/20
Sentence
古原生代（約25〜16億年前）に属する岩層は、古代の大気酸素化事象の痕跡を保存している。
Quizzes for review
Paleoproterozoic rock formations preserve evidence of ancient atmospheric oxygenation events.
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Paleoproterozoic rock formations preserve evidence of ancient atmospheric oxygenation events.
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