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anonymous

The Archean Eon - 0 views

forces.si.edu/...02_02_02.html

cyanobacteria archaen

shared by anonymous on 26 Jan 16 - No Cached
  • As cyanobacteria created more free oxygen, the amount of oxygen in the atmosphere reached one percent of today’s level, which is 21 percent.
  • anonymous on 26 Jan 16
     
    Cyanobacteria and oxygen level
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