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Oxygen levels first rose in the atmosphere because of _____.
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Oxygen levels first rose in the atmosphere because of _____.

User Brasimon
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Cyanobacteria.
These bacterias gain their energy through photosynthesis.

Oxygen levels first rose in the atmosphere because of _____.-example-1
Oxygen levels first rose in the atmosphere because of _____.-example-2
User Corn On The Cob
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cyanobacteria due to their use of photosynthesis. 
User Ken Shiro
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