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OpenStudy (anonymous):
Biology help: The length of time required for half of the radioactive isotope in a sample to decay is its a. half-life b. relative date c. radioactive date d. geologic time scale
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OpenStudy (taramgrant0543664):
It would be the isotopes half life
OpenStudy (anonymous):
The answer is option (a) half life .
OpenStudy (anonymous):
thanks guys
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