Protozoa
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Protozoa (singular: protozoan) are unicelluar eukaryotic organisms. Protozoa are unlike classic bacteria (prokaryotes), which do not contain nuclei or membrane-bound organelles, and metazoa (multicellular organisms), which are conglomerates of many eukaryotic cells.
Protozoa are the most abundant life forms on Earth, in number and biomass[1].