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taxonomy
the science of classifying organisms
binomial nomenclature
the system of unique, two part names for organisms
dichotomous key
a tool that allows the user to determine the identity of items and always gives two choices in each step
genus
a taxonomic group that consists of closely related species
domain
the largest group in the biological classification system
kingdom
a taxonomic group made up to similar phyla
phylum
the taxonomic group made up of related classes
class
a classification group made up of similar orders
species
a group of organisms that share most characteristics and can interbred to produce fertile offspring
geologic time scale
a representation of time based on the rock record of earth
eon
the longest unit on the geological time scale
era
a division of an eon on the geological time scale
period
a block of time on the geological time scale during which unique rock layers were layed down
epoch
the shortest division of geological time
