All of these kingdoms—Protoctista, Animalia, Plantae, and Fungi—belong to the domain Eukarya.
Eukarya is characterized by organisms that have complex, membrane-bound cells known as eukaryotic cells. These cells contain a nucleus and organelles, which distinguish them from prokaryotic cells found in the Bacteria and Archaea domains.
The Protoctista kingdom includes a diverse group of mostly unicellular organisms, such as algae and protozoans. The Animalia kingdom encompasses all animals, ranging from sponges to humans. Plantae consists of all plants, which are primarily autotrophic and capable of photosynthesis. Lastly, the Fungi kingdom includes organisms like mushrooms and yeast, which are primarily decomposers in various ecosystems.
In summary, the kingdoms you mentioned fall under the Eukarya domain due to their cellular structure and characteristics.