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

User Dominic Tracey
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2 votes

Answer:Cyanobacteria

Step-by-step explanation:

User Satoshi Nakajima
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3 votes

Answer:

Oxygen

Step-by-step explanation:

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

User JDMX
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