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Biology, 12.02.2021 05:50 momomo4

3. How do scientists know when a mass extinction took place?
A. They find more fossils of plants.
B. They find fossils of animals that died suddenly.
C. They find a sudden disappearance of many fossil species.
D. They find evidence of changes in Earth's atmosphere.

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3. How do scientists know when a mass extinction took place?
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