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Biology 15 Online
OpenStudy (anonymous):

How would you date a sample of rock that you suspect as being once of the earliest on Earth? a. use a radioactive isotope with a short half-life b. use a radioactive isotope with a long half-life c. use an index fossil d. use a microfossil

OpenStudy (anonymous):

I think it's b use a radioactive isotop with a long half life

OpenStudy (blues):

You're right - and thanks for posting your tentative answer as well as the question!

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