Final answer:
Kingdom Protista includes all eukaryotes that are not animals, plants, or fungi. Protists can be single-celled or multicellular and are divided into three groups based on their characteristics.
Step-by-step explanation:
Kingdom Protista includes all eukaryotes that are not animals, plants, or fungi. Protists are a diverse group of organisms that can range from tiny, unicellular organisms like amoebas to large, multicellular organisms like seaweed. They are divided into three groups: animal-like protists, plant-like protists, and fungi-like protists.