There are five kingdoms that classify living things: Plantae, Animalia, Fungus, Protist, and Monera. Each kingdom can be characterized by their cell type (unicellular or multicellular), how they obtain nutrition (photosynthesis or consuming other organisms), and other distinguishing features. For example, plants are multicellular and produce their own food via photosynthesis, while animals are multicellular and obtain nutrition by consuming other organisms.