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31.The radioisotope, iodine-131, is often used to...Select one:a. determine a fossil's age.b. treat cancer.c. treat thyroid problems.d. fuel a nuclear reactor.

User Marquis
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Step-by-step explanation:

Iodine-131 is usually used in treatment of thyroid gland affections.

Answer: c. treat thyroid problems.

User Sefe
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