Weegy: The Kingdom Protista includes an incredible diversity of different types of organisms, including algae, protozoans, and slime molds. No one even knows how many species there are, though estimates range between 65,000 to 200,000. [ All protists are eukaryotes, complex cells with nuclear membranes and organelles like mitochondria and chloroplasts. They can be either unicellular or multicellular, and in this group we find the first inkling of what is to come in evolutionary history, the union of eukaryotic cells into a colonial organism, where various cell types perform certain tasks, communicate with one another, and together function like a multicellular organism. ]
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