Scientists propose a new mechanism by which oxygen may have first built up in the atmosphere - Phys.org For the first 2 billion years of Earth's history, there was barely any oxygen in the air. While some microbes were photosynthesizing by the latter part of this period, oxygen had not yet accumulated a Author : Science X staff

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Last-modified: 2022-04-15 (金) 05:28:04 (749d)