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Index Fossils can help scientists determine the age of a rock layer because they are present in every rock layer since the beginning of life on Earth.
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Index Fossils can help scientists determine the age of a rock layer because they are present in every rock layer since the beginning of life on Earth.

User Rgb
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Answer:

They were only present during a short time frame, so it helps to narrow down the age of the rock layer.

Explanation: hope this helps :)

User Keba
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