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OpenStudy (anonymous):
A half-life is: A. the remains of ancient living things B. the time needed for half of a radioactive material to decay. C. removing items from the ground by digging. D. a gap in the rock record that indicated a time where no deposition has occurred, or where erosion has taken place.
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OpenStudy (anonymous):
I believe it is B.
OpenStudy (anonymous):
thank yu @R.Lee.M
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