Different types of unicellular organisms that belong to the kingdom Protista move through structures that include flagella, cilia and pseudopodia. To move around, a protist, such as a paramecium, has hair-like structures called cilia, while an amoeba has pseudopodia, which are feet-like appendages that extend from its cytoplasm. Flagella are whip-like structures used by a flagellate like euglena for locomotion.
These different types of protists are also known as protozoans. Although these protozoans can move, there is another type of protist, called sporozoan, that does not move. Sporozoans reproduce through spores.
These organisms are found in moist soil and different water environments. Protozoans are very small organisms, measuring between 0.01 to 0.50 millimeters.