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Plants kick-started evolutionary drama of Earth's oxygenation

Harlequinmania

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Harlequinmania

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Scientists have taken a significant step toward unlocking the secrets of oxygenation of the Earth's oceans and atmosphere. The new research indicates that the appearance of large predatory fish as well as vascular plants approximately 400 million years ago coincided with an increase in oxygen, to levels comparable to those we experience today. If so, then animals from before that time appeared and evolved under markedly lower oxygen conditions than previously thought.

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1000 Gallon Tank in the Hole 

http://www.sgreefclub.com/forum/topic/120957-1000-gallon-3d-hole-in-the-wall/ 

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