Protozoa are a diverse group of unicellular eukaryotic organisms that were coined in 1818. They are eukaryotic with a nucleus and organelles, rely on their environment for nutrition, and do not have chlorophyll. Protozoa include flagellates, ciliates, and amoebae that move using flagella, cilia, or pseudopods respectively. As components of micro and meiofauna, protozoa are an important food source and play a role in transferring production between trophic levels as both herbivores and consumers. Examples of protozoa discussed include the amoeba, trypanosoma, plasmodium, paramecium, and