In most habitats, Protozoa are found worldwide. They are only single cell animals. Many species of Protozoa are free living. They are unicellular eukaryotes with complex internal structure. Complex metabolic activities are easily carried out by these unicellular organisms. They have structures for different types of movements as well as for propulsion. Recently they are classified into six phyla. Many species of protozoa cause diseases in humans. Binary fission, sexual and asexual reproduction occurs in them. All parasitic protozoa need organic substances for living. Apicomplexa and Sarcomestigophora are parasitic protozoans that make cysts in their host.
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