What is one example of each kingdom?

One example from the Animalia kingdom is the tiger (Panthera tigris), a large carnivorous mammal. In the Plantae kingdom, an example is the oak tree (Quercus), known for its strength and longevity. An example from the Fungi kingdom is the common mushroom (Agaricus bisporus), widely consumed as food. Finally, in the Protista kingdom, an example is the amoeba, a single-celled organism often found in water.