Protist Kingdom

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“Kingdom Protista" is a mix kingdom; it contains organisms which are more closely related to members of other kingdoms than they are to other protists. Many studies used the word "protist" as a convenient term to mean "eukaryote that isn't a plant, animal, or fungus.

Protists include the single-celled eukaryotes living in pond water, although protist species live in a variety of other aquatic and terrestrial environments, and occupy many different niches. Not all protists are microscopic and single-celled; there exist some very large multicellular species, such as the kelps.

"Protists are responsible for a variety of human diseases including malaria, sleeping sickness, amoebic dysentery and trichomoniasis. Malaria in humans is a devastating disease. It is caused by five species of the parasite Plasmodium, which are transmitted to humans by female Anopheles mosquitoes.

Protists also play an important role in the environment. Nearly 50 percent of photosynthesis on Earth is carried out by algae.

https://www.livescience.com/54242-protists.html, https://ucmp.berkeley.edu/alllife/eukaryotasy.html