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Karolina [17]
3 years ago
14

How did earth's atmosphere become oxygen-rich

Biology
1 answer:
Helen [10]3 years ago
6 0
<h2>ANSWER:</h2>

Cyanobacteria or blue-green algae produce oxygen

<h2>EXPLANATION:</h2>

Most scientists consider that toward half of Earth's 4.6-billion-year antiquity, the atmosphere carried about no oxygen. Cyanobacteria or blue-green algae became the leading microbes to generate oxygen by photosynthesis, possibly as long ago as 3.5 billion years ago and certainly by 2.7 billion years ago

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