Which level of classification has the highest number of organisms?

The level of classification that encompasses the highest number of organisms is the Kingdom. In biological classification, the hierarchy starts from broad categories and narrows down to more specific ones.

The Kingdom is one of the broadest levels in this hierarchy and includes a vast variety of organisms. For example, in the domain of Eukarya, the kingdoms include numerous species from plants, animals, fungi, and protists. Each subsequent level of classification, such as Phylum, Class, Order, Family, Genus, and Species, becomes increasingly specific, leading to fewer organisms as you progress downwards in the hierarchy. Thus, the Kingdom level contains a diverse and extensive array of living organisms, making it the classification level with the highest number of organisms.