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  1. 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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  1. Trilobites are useful as index fossils, because each species existed for a short period of time over a wide geographic range. The correct option among all the options that are given in the question is the third option.

    3.     Use a radioactive isotope with a long half-life is a way to date a sample of rock that you suspect as being one of the earliest on Earth. The correct option among all the options is the second option.
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2. Trilobites are useful as index fossils, because each species existed for a short period of time over a wide geographic range. The correct option among all the options that are given in the question is the third option.


3. Use a radioactive isotope with a long half-life is a way to date a sample of rock that you suspect as being one of the earliest on Earth. The correct option among all the options is the second option.

Explanation:

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