Question

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

Explanation:

Carbon - 14 is a radioactive isotope of carbon. In the body, chemical reactions determine how atoms and molecules interact. Radioactive carbon - 14 reacts chemically in the same way as stable carbon isotopes because chemical reactions involve electrons, not the nucleus. Nuclear reactions are different and not relevant to the presence of carbon - 14 in organisms' molecules in terms of chemical behavior.

Answer:

The radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.