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photosynthetic bacteria that release oxygen as a waste product. Timothy Lyons, professor of biogeochemistry at the University of California, Riverside, says the group’s timeline for oxygen’s rise is a significant contribution towards a refined understanding of the co-evolution of Earth’s adolescence and environments.” However this gas was not at all times in such ample, life-sustaining supply, and in reality was largely absent from the ambiance for the primary 2 billion years of Earth’s historical past.

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