The organism which helped in increasing the oxygen content of primitive earth's atmosphere was
A
Yeast
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B
Marine plants
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C
Mushrooms
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D
Cyanobacteria
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Solution
The correct option is D Cyanobacteria Cyanaobacteria was the organism which helped in increasing the oxygen content of earth's atmosphere which encouraged the formation of other living organisms. Cyanobacteria is the only photosynthetic group of bacteria which are able to produce oxygen.