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To compare the ages of rock layers to each other, scientists can use an easily identifiable and widely distributed fossil called

A carbon fossil

A radioactive fossil

An index fossil

A sedimentary fossil

User Yoram
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2 Answers

4 votes
index fossil is the answer. sorry if I’m late
User Shamittomar
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3 votes
The answer is an index fossil.

Hope that helps (:
User Ikutsin
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