The term ONE-CELLED PROTOZOA can be summed up in one word: AMOEBA. Amoebas are single-celled organisms that belong to the kingdom Protista. They are found in a variety of environments, including freshwater, marine, and soil habitats. Amoebas are able to move and feed by extending their pseudopodia, or false feet, which they use to capture food particles. They reproduce asexually by dividing into two daughter cells.