The Earth's early atmosphere contained abundant molecular oxygen (O2), which allowed life to form .

Name: The Earth's early atmosphere contained abundant molecular oxygen (O2), which allowed life to form .
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The Earth's early atmosphere was primarily composed of gases like methane, ammonia, water vapor, and carbon dioxide, with little to no molecular oxygen. Oxygen levels increased significantly only after the Great Oxygenation Event, which occurred due to photosynthetic organisms.

The Earth's Early Atmosphere Contained Abundant Molecular Oxygen (O2), Which