What kingdoms and sub-kingdoms are currently singled out in wildlife? Based on what signs?

Currently, a biological system has become widespread, in which all living organisms are divided into five kingdoms: Bacteria, Protists, Mushrooms, Plants and Animals. At the same time, it is impossible to draw a sharp line between the individual kingdoms on only a few grounds. For example, representatives of the kingdoms of Mushrooms and Plants are characterized by similar symptoms. Only a deep analysis of the totality of characters, based on their origin, patterns of structure and activity, as well as a thorough study of the phylogenetic relationships between different groups of organisms, allows us to attribute a species or a larger taxon to a particular kingdom.

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