The protistans are conventionally divided into three categories: protozoans (animal-like), algae (plant-like), and slime molds (fungus-like). However, these categories are not evolutionarily related. We will now examine a few protozoan phyla, and one phylum of algal protistans. Protists are single and multicellular organisms that are plant-like, animal-like and fungi-like. They evolved from bacteria and represent the intermediate step in the evolution of the other three kingdoms. There are 12 phyla in this kingdom, most of which live in water. |