What kingdoms are used to classify organisms?
Originally, Linneaus described only two kingdoms (plants and animals). Over time, we've realized that more are needed.
You are probably familiar with plants and animals . Fungi are multicellular but do not have chloroplasts and they are heterotrophic. Protista is a diverse group. They can be unicellular or multicellular. Archaea are prokaryotic, and unicellular organisms with genes and metabolic pathways that make them different from bacteria. Bacteria are unicellular and were among the first forms of life to evolve on Earth. For more information, check out the Wikipedia article on Kingdoms.