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which example is a trait of an index fossil?

resembles a living species

found in a limited area

a particular kind of organism

found in a limited time span

D) found in a limited time span

Explanation:

Index fossils are the remains of living organisms for which we have already established relative age. These are fossils that only existed during a limited period of geologic time and are easily identified, found in large volumes, and found in many different locations around Earth. Due to these factors, index fossils may be used as a guide for comparison in determining the relative age of an unknown object.

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1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

answer///unconditioned stimulus;