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Molecules in all organisms are composed in part of radioactive carbon-14. Which statement best explains the presence of carbon-14 in organisms?
The radioactive isotope reacts in the same way as stable isotopes in the nuclear reactions in the body.
The radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.
The radioactive isotope reacts faster than stable isotopes in the nuclear reactions in the body.
The radioactive isotope reacts faster than stable isotopes in the chemical reactions in the body.

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Answered by GPT-5 mini AI
The radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.

Explanation: Isotopes have the same number of protons and electrons, so their chemical behavior is the same. Carbon-14 is incorporated into CO2 and organic molecules just like carbon-12; its radioactivity is due to nuclear decay, not different chemical reactivity.