In five Kingdom classification, single celled eukaryotes are included in:
The term 'Protista' is derived from the Greek word “protistos”, meaning “the very first“. Protists are simple eukaryotic organisms that are neither plants nor animals or fungi. Protists are unicellular in nature but can also be found as a colony of cells. Most protists live in water, damp terrestrial environments or even as parasites.