Six-kingdom system

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The six-kingdom system is a somewhat antiquated system of classification of living organisms. The more modern version of the classification is a three-domain system, where two of the three domains form their own kingdoms and the third splits into four kingdoms.

The kingdoms are as follows:

Kingdom name Names of things in the kingdom Distinguishing feature set
animalia animal eukaryotic, multicellular, no cell wall, motile cells, heterotrophic, embryos go through a blastula stage
plantae plant (also includes algae which are sometimes not thought of as plants) eukaryotic, multicellular, cell wall composed of cellulose, autotrophic phototrophic possessing chlorophyll, have plastids
fungi fungus eukaryotic, multicellular, cell wall composed of chitin, heterotrophic saprotroph,
protista protist eukaryotic, unicellular, may be plant-like (protophyta) or animal-like (protozoa)
bacteria (also called eubacteria) bacterium prokaryotic, unicellular
archaaa (also called archaebacteria) prokaryotic, unicellular