* Animalia (Animals)
* Plantae (Plants)
* Fungi
These three kingdoms are distinguished by their multicellular structure, meaning they are composed of multiple cells working together to form tissues, organs, and organ systems.
While there are some exceptions within these kingdoms (like the single-celled yeast in Fungi), the vast majority of organisms within these kingdoms are multicellular.
It is important to note that some protists, which are typically single-celled, can form colonies of cells. However, they do not have the complex organization of tissues and organs found in animals, plants, and fungi.
