Anoxia

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During the [[Hadean]] and [[Archean]] [[eon]]s the entire biosphere was anoxic and stayed that way till [[Photosynthesis|photosynthetic]] plants became dominant.  When the Earth's atmosphere came to include large amounts of free oxygen that was called the [[Oxygen Catastrophe]] and lead to a [[mass extinction]] of anaerobic organisms.
During the [[Hadean]] and [[Archean]] [[eon]]s the entire biosphere was anoxic and stayed that way till [[Photosynthesis|photosynthetic]] plants became dominant.  When the Earth's atmosphere came to include large amounts of free oxygen that was called the [[Oxygen Catastrophe]] and lead to a [[mass extinction]] of anaerobic organisms.
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[[Fish]]es living in anoxic water or in water with low oxygen content may evolve ability to swim to the surface and breath air.  This may have been a factor in the [[evolution]] of [[lungfish]] and later terrestrial vertebrates.

Latest revision as of 07:08, 29 December 2013

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