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Study pinpoints timing of oxygen’s first appearance in Earth’s
Element Of Oxygen by Matthew Hope
Atmosphere Design Lab: O2 - Where Does Oxygen Come From?
Oxygen levels - Understanding Global Change
First Oxygen Appeared On Earth Way Earlier Than We Realised | Gizmodo
Dr. Aramis Odysseus: July 2016
How Much Oxygen Comes from the Ocean? - American Oceans
How much do oceans add to world's oxygen? | Earth | EarthSky
TIL Algae produces most of the world's oxygen : r/todayilearned
