Potassium-40 is useful in determining the age of a fossil
A. in samples less than 25,000 years of age.
B. in samples of 40,000 to 50,000 years of age.
C. in samples 300,000 years of age and older.
D. in samples aged between 50,000 and 100,000 years of age.
E. in samples aged between 100,000 years and 250,000 years.
Answer: C. in samples 300,000 years of age and older.
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