Protozoa
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Protozoa are a diverse group of single-cell eukaryotic organisms, many of which are motile. Throughout history, protozoa have been defined as single-cell protists with animal-like behavior, e.g., movement. Protozoa were regarded as the partner group of protists to protophyta, which have plant-like behaviour, e.g., photosynthesis.
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Sub-groups
Protozoa have been divided traditionally on the basis of their means of locomotion.
- Flagellates (e.g., Giardia lamblia)
- Amoeboids (e.g., Entamoeba histolytica)
- Sporozoans (e.g., Plasmodium knowlesi)
- Ciliates (e.g., Balantidium coli)
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Human disease
Some protozoa are human parasites, causing diseases.
Examples of human diseases caused by protozoa:
- Malaria
- Amoebiasis
- Giardiasis
- Toxoplasmosis
- Cryptosporidiosis
- Trichomoniasis
- Leishmaniasis
- Sleeping Sickness
- Dysentery
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