helped in increasing the oxygen content of primitive earth's atmosphere.

Yeast

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Marine plants

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Mushrooms

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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.

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