What can you conclude from studying this graph?
A) Potassium-40 has a half-life of 1.25 billion years.
B) Argon-40 has a half-life of 1.25 billion years.
C) Both potassium-40 and argon-40 have half-lives of 1.25 billion years.
D) It takes 5 billion years to turn potassium-40 into argon-40.
A) Potassium-40 has a half-life of 1.25 billion years.
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What will be an ideal response?
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