DREADFUL101 DREADFUL101

25-07-2019
Biology

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Which major gas in today’s atmosphere was introduced by living organisms about 2.7 billion years ago?

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madison3395 madison3395

25-07-2019

Answer:

Oxygen

Explanation:

Oxygen is the major gas in today’s atmosphere that was introduced by living organisms about 2.7 billion years ago.

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jalierico20 jalierico20

25-07-2019

Answer:Cyanobacteria

Explanation:

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