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  1. Protozoa - Wikipedia

    Protozoa may also live as mixotrophs, combining a heterotrophic diet with some form of autotrophy. Some protozoa form close associations with symbiotic photosynthetic algae (zoochlorellae), which …

  2. Protozoan | Definition, Parasites, Diseases, Characteristics, Size ...

    Nov 8, 2025 · protozoan, organism, usually single-celled and heterotrophic (using organic carbon as a source of energy), belonging to any of the major lineages of protists and, like most protists, typically …

  3. Protozoa and the Illnesses They Cause - Verywell Health

    Oct 19, 2025 · Protozoa are tiny, single-celled organisms that can cause diseases like malaria, giardia, and toxoplasmosis. Protozoan infections can be identified through blood, stool tests, or biopsies.

  4. Protozoa - Definition, Examples, Characteristics, and Classification

    Aug 3, 2023 · Protozoa are unicellular eukaryotic microorganisms having a membrane-bound nucleus and other organelles within their cells. Despite their small size, they are incredibly diverse and exist …

  5. What are Protozoa? - Microbiology Society

    What are Protozoa? Protozoa are micro-organisms which have a membrane bound nucleus that can't be categorised as a fungi, animal or plant. Most protozoa are free living, but some are parasitic. They …

  6. About Parasites | Parasites | CDC

    Nov 14, 2024 · Protozoa are microscopic, one-celled organisms that can be free-living or parasitic in nature. They are able to multiply in humans, which contributes to their survival and also permits …

  7. Protozoa - New World Encyclopedia

    Protozoa (in Greek proto = first and zoa = animals) is a diverse group of single- celled, microscopic or near-microscopic eukaryotes (organisms whose cells have nuclei) that commonly show …

  8. 9: Protozoa - Biology LibreTexts

    Protozoa are unicellular eukaryotic microorganisms lacking a cell wall and belonging to the Kingdom Protista. Protozoa reproduce asexually by fission, schizogony, or budding.

  9. Protozoa - Definition, Types and Examples | Biology Dictionary

    Apr 28, 2017 · Organisms known as protozoa include a wide range of organisms, most of which are free-living single-celled eukaryotes. Therefore, protozoa fit into the Domain Eukarya.

  10. Protozoa: Characteristics, Classification, and Examples

    Jul 19, 2021 · In 1822, the scientist Goldfuss first used the term protozoa. Protozoa are referred to as animals whose bodies are made up of a single cell. However, it represents a division of Protista and …