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Protozoa (sg.: protozoan or protozoon; alternative plural: protozoans) are a polyphyletic group of single-celled eukaryotes, either free-living or parasitic, that feed on organic matter such as other microorganisms or organic debris.
Protozoan infections are responsible for diseases that affect many different types of organisms, including plants, animals, and some marine life. Many of the most prevalent and deadly human diseases are caused by a protozoan infection, including African sleeping sickness , amoebic dysentery , and malaria .
While protozoa reproduce mainly asexually, some protozoa are capable of sexual reproduction. [33] Protozoa with sexual capability include the pathogenic species Plasmodium falciparum, Toxoplasma gondii, Trypanosoma brucei, Giardia duodenalis and Leishmania species. [14] Ciliophora, or ciliates, are a group of protists that utilize cilia for ...
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Microscopic organisms were increasingly constrained in the plant/animal dichotomy. In 1858, the palaeontolgist Richard Owen was the first to define Protozoa as a separate kingdom of eukaryotic organisms, with "nucleated cells" and the "common organic characters" of plants and animals, although he also included sponges within protozoa. [27]
The giant size of a Pyr make it necessary to be careful during training to make sure they understand how powerful they are and how capable they are of causing damage without meaning to.
p>At the Milwaukee County Zoo, the holiday spirit is as large as some of the residents. The zoo shared a delightful scene of their elephants — Belle, Ruth and Brittany — engaging in a bit of ...
Malaria is caused by a protozoan called Plasmodium falciparum. P. falciparum parasites are transmitted mainly by the Anopheles gambiae complex in rural Africa. [54] In just this area, P. falciparum infections comprise an estimated 200 million clinical cases and 1 million annual deaths. 75% of individuals affected in this region are children. [57]