Based on cladistics, which eukaryotic kingdom is polyphyletic and, therefore, unacceptable as Protista.
The absence of other eukaryotes means that protists do not constitute a natural group, or clade, even though it seems likely that they all descended from a common ancestor.
Simple eukaryotic organisms known as protozoa are not classified as either plants, animals, or fungus. Their cells have membrane-bound organelles and a nucleus (eukaryotic organisms). Plasmodium, slime molds, and euglena are a few examples.
All eukaryotes that are not fungi, animals, or plants are collectively referred to as protozoa. It is a tremendously diverse group of species as a result. Beyond a rather straightforward organizational structure, the eukaryotes that make up this kingdom, Kingdom Protista, do not share many characteristics.
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