when is an organism classified as a protist
Protist A protist (/ˈproʊtɪst/) is any eukaryotic organism that has cells with nuclei and is not an animal, plant or fungus. The protists do not form a natural group, or clade, since they have no common characteristic origin, but, like algae or invertebrates, they are often grouped together for convenience. In some systems of biological classification, such as the popular five-kingdom scheme proposed by Robert Whittaker in 1969, the protists make up a kingdom called Protista, composed of "organisms which are unicellular or unicellular-colonial and which form no tissues".[2][3][A]