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2. What was the first source of oxygen?
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2. What was the first source of oxygen?

User Johnny Cage
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3 votes

Answer:

phytoplankton

Step-by-step explanation:

phytoplankton

User Florian Golemo
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The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen

User Chetan Shenoy
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