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Biology 4 Online
PrettyEyes:

What is half-life? The time it takes for the radioactivity of a specific isotope to fall to half its original value The time it takes for the radioactivity of a specific isotope to fall to half its original value The time it takes for a geologist to determine the age of a rock or mineral The time it takes for a geologist to determine the age of a rock or mineral Half the life of an organism Half the life of an organism The length and organism lived in prehistoric times The length and organism lived in prehistoric times

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