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Which nuclides are used to date the remains of a once-living organism? (1) C-14 and C-12 (3) I-131 and Xe-131 (2) Co-60 and Co-59 (4) U-238 and Pb-206

Which nuclides are used to date the remains of a once-living organism? (1) C-14 and C-12 (3) I-131 and Xe-131 (2) Co-60 and Co-59 (4) U-238 and Pb-206
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Which nuclides are used to date the remains of a once-living organism?

(1) C-14 and C-12 (3) I-131 and Xe-131
(2) Co-60 and Co-59 (4) U-238 and Pb-206

User Kurt Van Den Branden
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The  answer is (1) C-14 and C-12. The life on the earth is carbon based. Carbon is important in living organisms. So C-14 and C-12 can be used to date the remains of a once-living organism. 
User Cardamom
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