What Did the Accumulation of Free Oxygen in Earth's Atmosphere

question 57

Multiple Choice

What did the accumulation of free oxygen in Earth's atmosphere began with?

• A)the origin of life and respiratory metabolism
• B)cyanobacteria using photosystem II
• C)chloroplasts in photosynthetic eukaryotic algae
• D)land plants
• E)the breakdown of CO₂

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