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'Dark oxygen': a deep-sea discovery that has split scientists
'Dark oxygen': a deep-sea discovery that has split scientists
Economy
by  AFP

Could lumpy metallic rocks in the deepest, darkest reaches of the ocean be making oxygen in the absence of sunlight? This cast doubt on the long-established view that life was made possible when organisms started producing oxygen via photosynthesis, which requires sunlight, about 2.7 billion years ago.