EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS
Protists are of the Kingdom Protista and are one of the diverse
eukaryotes, single-celled species of which may resemble the first
eukaryotic cells. At the present they are categorized by what they are
not (not bacteria, fungi, plants, or animals).
Starr, C. and R. Taggart. 1998. Biology: the unity and diversity of life.
Wadsworth Publishing Company. Belmont, California.