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ch 7.1

TermDefinition
eon largest units of of geologic time
era eons are subdivided into smaller units of time
periods eras are subdivided into this
epochs periods are subdivided into this
mass extinction the extinction of many species on earth within a short period of time
land bridge connects the two continents that were previously seperated
geographic isolation the separation of a population of organisms from the rest of its species due to some physical border
Created by: rickebry8209