Critical Reasoning (CR) | Re: Scientists examined diamonds that were formed on Earth about 2.9

Scientists examined diamonds that were formed on Earth about 2.9 billion years ago. These diamonds had a higher-than-normal concentration of sulfur-33. This
concentration can be explained only by certain chemical reactions that are stimulated by ultraviolet light. If there had been more than a trace of oxygen in Earth's
atmosphere 2.9 billion years ago, then not enough ultraviolet light would have reached Earth 's surface to stimulate the chemical reactions.

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