Biology

23 January, 16:03

A potassium isotope has a half-life of 1.25 billion years. Given that scientists estimate Earth's age to be 4.6 billion years, what is the most likely percentage of parent to daughter isotopes of this element currently existing on Earth?

A. Less than 10 percent

B. 25 percent

C. 50 percent

D. More than 75 percent

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