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2. trilobites are useful as index fossils, because each species existed for a . long period of time over a wide geographic range. long period of time over a small geographic range. short period of time over a wide geographic range. short period of time over a small geographic range. 3. how would you date a sample of rock that you suspect as being one of the earliest on earth? . use a radioactive isotope with a short half-life. use a radioactive isotope with a long half-life. use an index fossil. use a microfossil.
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2. trilobites are useful as index fossils, because each species existed for a . long period of time...
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