Please Help, this is for a Unit Test question 1: What accounts for the significant increase in oxygen in earth's atmosphere 2 to 2. 5 billion years ago,? A. Living organisms B. Volcanic outgassing C. Condensation

Please Help, this is for a Unit Test

question 1: What accounts for the significant increase in oxygen in earth's atmosphere 2 to 2. 5 billion years ago,?

A. Living organisms

B. Volcanic outgassing

C. Condensation

D. Chemical reactions in the atmosphere

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Please Help, this is for a Unit Test question 1: What accounts for the significant increase in oxygen in earth's atmosphere 2 to 2. 5 billion years ago,? A. Living organism…

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