if fossils are in many different places, but only lived for a short period of time what are they considered

index fossils

Explanation:

An ideal index fossil

Explanation: An ideal index fossil lived during a short period of time, was geographically and environmentally widespread, and is easy to identify. Some of the most useful index fossils are hard-shelled organisms that were once part of the marine plankton.

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six grader is what i am ssorry