Six-kingdom system

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