Which kingdom is the largest in terms of the number of species?

The largest kingdom in terms of the number of species is Kingdom Animalia, which includes a diverse range of eukaryotic organisms. Animalia encompasses everything from microscopic plankton to the largest creatures on Earth, such as whales and elephants. This kingdom is characterized by multicellular, heterotrophic organisms that typically move under their own power and respond to external stimuli. Some estimates suggest that there are over one million known species of animals, with many more still awaiting discovery. While Kingdom Monera is not the largest kingdom in terms of the number of species, it is still an important group of prokaryotic organisms that play essential roles in a wide variety of ecological processes.