If the unstable atoms in a rock have a half - life of 2 millions years and the rock begins with the 8 mg of unstable atoms, how many milligrams of unstable atoms will be found in the rock 4 million years after its formation? A. 8 mg
B. 4 mg
C. 2 mg
D. 1 mg​

the correct answer to this question is #5

answer increasing the intensity, duration,and frequency of exercise progressively;

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