What Are the Seven Classifications in Science?

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The seven classifications of science are kingdom, phylum, class, order, family, genus and species. These classifications are nested; for instance, organisms must be in the same kingdom to be in the same phylum.


Each species is classified into one of these six kingdoms: plants, animals, protists, fungi, archaebacteria and eubacteria.


A phylum is a grouping of organisms in one kingdom that have the same body plan.


Classes are a further grouping of organisms with similar traits.


Animals in the same order share further characteristics, such as being warm blooded.


The classification of family becomes more specific, with organisms sharing many physical traits.


In the genus classification, organisms are structurally related.


In a species, organisms can exchange genes and interbreed.

Example Classification for a Grizzly Bear

  • Kingdom: Animalia
  • Phylum: Chordata
  • C lass: Mammalia
  • Order: Carnivora
  • Family: Ursidae
  • Genus: Ursus
  • Species: Horribilus

There is some argument about some organisms when they are classified, but in general, this system works for the majority of organisms in existence.