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    Scientific American Biology
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    Exam 17: Life on Earth Qa: Evolution
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    If You Don't Know How Many Radioactive Isotope Atoms Were
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If You Don't Know How Many Radioactive Isotope Atoms Were

Question 58

Question 58

Essay

If you don't know how many radioactive isotope atoms were present at the time a rock was formed,how can you tell how many have decayed since that time?

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You can accomplish this by comparing the...

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