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 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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