11-09-2022
Biology

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What was Earth's early atmosphere like before cyanobacteria?

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ogando12071 ogando12071

11-09-2022

Answer:

Oxygen-free

Explanation:

Before about 2.4 billion years ago, Earth was a virtually oxygen-free environment. The appearance of cyanobacteria, or blue-green algae, changed all that. Cyanobacteria injected the atmosphere with oxygen, setting the scene for the development of complex life as we know it.

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