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What best describes index fossils? Organisms that existed over a limited period . Organisms whose age is hard to detect. Fossils that are used in radioactive dating. Fossils of the most ancient organisms.

Respuesta :

Index fossils are organisms that were geographically widespread but limited to a short span of geologic time.

So your answer is A. Organisms that existed over a limited period.
milesrowland06

Answer:

A

Explanation:

I Big Bran

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