How did oxygen become present in earth atmosphere?
Organisms produce Earth's oxygen. Cyanobacteria or blue-green algae became the first microbes to produce oxygen by photosynthesis.
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About Oxygen
Oxygen is a television channel geared towards women owned by NBCUniversal. The channel's slogan is ''Live Out Loud.'' Some of the channel's original series include 'The Bad Girls Club,' 'All About Aubrey,' 'Snapped,' 'Tori & Dean: Home Sweet Hollywood,' and 'Jersey Couture.'
About Microbes
Microbes are microorganisms, single cell, or multi-celled, simple creatures. Microbes are germs, bacteria and viruses.
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