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Question of the Day: Middle School Earth and Space Science

An index fossil is a fossil of an organism that only existed for a short time in geologic history. How might these fossils be useful to scientists?

Because index fossils only existed for a short time, they can be used as a marker to identify the time period of a rock layer.

Because index fossils only existed for a short time in geologic history, they are used as markers for volcanic eruptions.

Index fossils are evidence of major extinction events because they appear and go extinct relatively quickly.

Index fossils show an evolutionary transition from one species into the next.

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