The atmosphere shifted from a reducing to an oxidizing state over 420 million years ago, allowing terrestrial life to emerge due to sufficient ozone buildup.
The atmosphere transitioned from reducing to oxidizing over 420 million years ago, enabling land life due to ozone formation.
| Front | When did the Oxidizing/Reducing tendency of the atmosphere change? What was the change and what was its effect? |
|---|---|
| Back | Over 420 million years ago From a reducing atm to an oxidizing one Enough ozone had built up to allow life on land |
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