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16 terms

Classification of Living Things

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classification
the arrangement of organisms into orderly groups based on their similarities and presumed evolutionary relationships
kingdom
the most general of the seven levels of classification
phylum
the level of classification after kingdom; the organisms from all the kingdoms are sorted into several phyla
class
the level of classification after phylum; the organisms in all phyla are sorted into class
order
the level of classification after class; the organisms in all the classes are sorted into orders
family
the level of classification after order; the organisms in all orders are sorted into families
genus
the level of classification after family; the organisms in all families are sorted into genera
species
the most specific of the seven levels of classification; characterized by a group of organisms that can mate with one another to produce fertile offspring
taxonomy
the science of identifying, classifying, and naming living things
dichotomous key
an aid to identifying unkown organisms that consists of several pairs of descriptive statements; of each pair of statements, only one will apply to the unkown organism, and that will lead to another set of statements, and so on, until the unknown organism can be identified
Archaebacteria
a classification kingdom that contains ancient bacteria that thrive in extreme environments
Eubacteria
a classification kingdom containing mostly free-living bacteria found in many varied environments
Protista
a kingdom of eukaryotic single-celled or simple, multicellular organisms; kingdom Protista contains all eudaryotes that are not plants, animals, or fungi.
Plantae
the kingdom that contains plants - complex, multicellular organisms that are usually green and use the sun's energy to make sugar by photosynthesis.
Fungi
a kingdom of complex organisms that obtain food by breaking down other substances in their surroundings and absorbing the nutrients
Animalia
the classification kingdom containing complex, multicellular organisms that lack cell walls, are usually able to move about, and possess nerbous systems that help them be aware of a react to their surroundings