Asked by diddy
FOSSILS & ROCK AGES
WHICH ISOTOPE IS PRESENT IN LIVING ORGANISMS?
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A. POTASSIUM-39
B. URANIUM-235
C. ALUMINUM-26
D. CARBON-14
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D. Carbon-14.
Carbon-14 is incorporated into living organisms (via CO2) while they are alive; after death it decays (half-life ≈ 5730 years), which is the basis of radiocarbon dating. (By contrast U-235 and Al-26 are not present in living tissue for dating, and K-39 is a stable isotope — K-40 is the radioactive potassium used in rock dating.)
Carbon-14 is incorporated into living organisms (via CO2) while they are alive; after death it decays (half-life ≈ 5730 years), which is the basis of radiocarbon dating. (By contrast U-235 and Al-26 are not present in living tissue for dating, and K-39 is a stable isotope — K-40 is the radioactive potassium used in rock dating.)
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