A sample is in the second half-life. What percent of the sample is stable at this point? A. 12.5%

B. 25%

C. 50%

D. 75%

i think it is true since you can test the answer and can use observations to complete it.

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space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

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