Social Sciences, asked by ahmedpa950, 6 months ago

around - years ago there was a widespread change in the atmosphere in the world

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Answered by ranjitselvand

Answer:

Since the Earth was formed more than 4 billion years ago, the atmosphere has changed profoundly. A wide variety of geochemical and ecological (fossil) evidence indicates that oxygen levels rose dramatically about 2 billion years ago.

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around - years ago there was a widespread change in the atmosphere in the world​

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around - years ago there was a widespread change in the atmosphere in the world