Examlex
Ayelen is so used to having many options in the cereal aisle of the supermarket that she feels uncomfortable in smaller stores with fewer options. Ayelen's society is most likely in the ______ period.
Half-Life
The time required for half the atoms of a radioactive substance to decay or for a drug or other substance to lose half its pharmacologic, physiologic, or radiologic activity.
Potassium-40
A radioactive isotope of potassium used in dating geological materials, as it decays into argon-40 over a known period of time.
Carbon-14
A radioactive isotope of carbon used in dating organic materials and archaeological objects through radiocarbon dating methods.
Carbon-12
A stable isotope of carbon with six protons and six neutrons, used as a standard in atomic mass units.
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