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Characteristics of Protists. Protists are eukaryotic organisms that cannot be classified as a plant, animal, or fungus. They are mostly unicellular, but some, like algae, are multicellular.Kelp, or 'seaweed,' is a large multicellular protist that provides food, shelter, and oxygen for numerous underwater ecosystems.ingdom Protista contains the protists, or all the organisms that do not fit into the other kingdoms of life. Protists can be heterotrophic or autotrophic, mobile or immobile, single-celled or multi-celled, solo or a member of a colony.
1 Red algae and green algae include unicellular species, colonial species, and multicellular species. 2  These protists have a special photosynthetic species that are the base of the food web in some habitats. Stramenopiles main characteristic is the flagellum that each protist has. 2  In most protists in this phylum, the hairy flagellum is paired with a short smooth flagellum. o Diatoms: Diatoms are unicellular and are producers of the food chain. 3  These organisms have a cell wall that is made of silica.