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binomial nomenclature
Classification system in which each species is assigned a two-part scientific name
class
similar orders grouped together
genus
A classification grouping that consists of a number of similar, closely related species
systematics
A scientific discipline focused on classifying organisms and determining their evolutionary relationships.
Taxon (plural), Taxa (singular)
group or level of organization into which organisms are classified
Taxonomy
The scientific study of how living things are classified
Family
Group of genera that share many characteristics
order
several genera that share many similarities
phylum
Group of closely related classes
kingdom
large taxonomic group, consisting of closely related phyla
domain
A taxonomic category above the kingdom level. The three domains are Archaea, Bacteria, and Eukarya.
phylogeny
Evolutionary history of a species or group of species.
clade
A group of species that includes an ancestral species and all its descendants, living and extinct.
monophyletic group
A clade must be a monphyletic group which includes a common ancestor and all of its descendants.
cladogram
Diagram that shows the evolutionary relationships among a group of organisms
derived character
a trait that arose in the most recent common ancestor of a particular lineage and was passed along to its descendants
bacteria
Domain of unicellular prokaryotes that have cell walls containing peptidoglycan.
archaea
Domain of unicellular prokaryotes that have cell walls that do not contain peptidoglycan
eukarya
Domain of all organisms whose cells have nuclei, including protists, plants, fungi, and animals.
Dichotomous key (classification key)
A key for the identification of organisms based on a series of paired statements or questions that describe alternative possible characteristics of an organism. The paired statements usually describe the presence or absence of certain visible characteristics or structures.
Linnaean Classification System
A classification system that organizes species into ordered (hierarchical ranks), species, genus, family, order, class, phylum, and kingdom.
Do Kings Play Cards On Fat Green Stools?
One strategy for remembering classification levels from least to most specific: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
Did King Phillip Come Over For Good Spaghetti?
Another strategy for remembering classification levels from least to most specific: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.
Protists
A eukaryotic organism that cannot be classified as an animal, plant, or fungus.
Fungi
A kingdom made up of nongreen, eukaryotic organisms that have no means of movement, reproduce by using spores, and get food by breaking down substances in their surroundings and absorbing the nutrients.
Fungus
The singular form of the word "fungi."
Unicellular
A single celled organism. (one cell)
Multicellular
Consisting of many cells
Ancestor
A relative who lived in the past
Descendant
one who comes down from a common ancestor.
organism
A living thing
species
A group of similar organisms that can breed and produce fertile offspring.
Which is bigger? Class or Family?
Class
Subspecies
group within a species that differs enough from another group in the species
Note 
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