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Oxygen deficit delayed evolution?

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dissolved oxygen/ Chris Reinhard, Georgia Tech

From ScienceDaily:

Evolution may have been waiting for a decent breath of oxygen, said researcher Chris Reinhard. And that was hard to come by. His research team is tracking down O2 concentrations in oceans, where earliest animals evolved.

By doing so, they have jumped into the middle of a heated scientific debate on what rising oxygen did, if anything, to charge up evolutionary eras. Reinhard, a geochemist from the Georgia Institute of Technology, is shaking up conventional thinking with the help of computer modeling.Paper. (paywall) – More.

The oxygen on early Earth debate has reached way higher decibels than information levels.

See, for example, Rise of animals and oxygen on early Earth.

and

All the contradictory early Earth oxygen theories we’ve tracked
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