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Darley and Latané observed that most university students failed to help a person having an epileptic seizure when they thought there were four other witnesses to the emergency. The students' failure to help is best explained in terms of
Evolution
The method through which various types of life are believed to have evolved and branched out from ancestral forms throughout Earth's history.
Radioisotopes
Unstable isotopes that spontaneously emit radiation; also called radioactive isotopes.
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.
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