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ANTONII [103]
3 years ago
15

How did Earth's atmosphere become oxygen-rich?

Biology
1 answer:
bekas [8.4K]3 years ago
4 0

D. Biological activity

Explanation:

The earth's atmosphere became oxygen rich as a result of biological activities. Early earth atmosphere was toxic one and in its reducing state.

  • The activities of micro-organisms such as cyanobacteria led to the production of oxygen.
  • These organisms manufacture their food in the presence of sunlight and water in the process of photosynthesis.
  • The bye product of this reaction is oxygen.
  • The intense presence of these living organisms led to the surge in atmospheric oxygen.

Learn more:

Photosynthesis brainly.com/question/4216541

#learnwithBrainly

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