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The History of Life
Half-life
Half-life definition: The time it takes for half the atoms of a radioactive isotope to decay.
Related Terms
Anthropoid
Bipedal
Cambrian Explosion
Endosymbiotic Theory
Epoch
Era
Geologic Time Scale
Index Fossil
Mass Extinction
Paleontologist
Period
Plate Tectonics
Primate
Radiometric Dating
Relative Dating
Spontaneous Generation
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