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Jurassic drop in ocean oxygen lasted a million years

Ocean oxygen is key to animal evolution

Ancient air pockets changing the history of Earth’s oxygen

Buried oxygen rose to the occasion as Earth’s early atmosphere formed

ChemCam findings hint at oxygen-rich past on Mars

Can animals thrive without oxygen?

Enough oxygen on Earth long before animals rose

Smothered oceans: Extreme oxygen loss in oceans accompanied past global climate...

Iron toxicity for cyanobacteria delayed oxygen accumulation in early Earth’s atmosphere

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