Detailed text transcripts for TV channel - DW - 20171107:12:44:00
When tiny organisms known as blue green algae was cyanide bacteria evolved they produced oxygen by means of photosynthesis molecular oxygen escaped from the water and took up residence in the atmosphere and millions of years later some of it began to break. down react and generate a layer of ozone. that protective shield unable to life to develop on land plants enrich the atmosphere with more and more oxygen. until three hundred fifty million years ago the earth's atmosphere had as much oxygen as it does today. if you have a science question and then some didn't by going to our website if we a...
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