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The History of Life
Period
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Period definition: A unit of geologic time that lasts tens of millions of years, it is longer than an epoch but shorter than an era.
Related Terms
Anthropoid
Bipedal
Cambrian Explosion
Endosymbiotic Theory
Epoch
Era
Geologic Time Scale
Half-life
Index Fossil
Mass Extinction
Paleontologist
Plate Tectonics
Primate
Radiometric Dating
Relative Dating
Spontaneous Generation
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