Index fossils are the remains of species that were once abundant and

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Annalise Dawson

Physics

2 October, 18:18

Index fossils are the remains of species that were once abundant and

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Deanna · Answer 1

The question is asking to complete the sentence: index fossils are the remains of species that were once abundant and ( ...). Index fossils are used to be able to see that a certain layer of soil was from a particular period of time. This means that they could not have lived long - just for a short period in the geological history. Typically, index fossils were also geographically widespread, but it's not always the case