Answer:
Viruses are not considered as something that is living, that makes them different from bacteria, protists and fungi. Bacteria are a prokaryote which makes them different from protists and fungi that are eukaryotic. Protists are always unicellular, while fungi can be either unicellular or multicellular (but mostly multicellular). Viruses, bacteria, protists and fungi can all be pathogenic. Viruses, bacteria, protists and fungi. All these are essential for life because they maintain living things, keeping everything in balance - a perfect equilibrium.