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en.wikipedia.org/wiki/Protozoa

Protozoa (also protozoan, plural protozoans) is an informal term for single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris. Historically, the protozoa were regarded as "one-celled animals", because they often possess animal-like behaviors, such as motility and predation, and lack a cell wall, as ...

www.britannica.com/science/protozoan

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 microscopic. All protozoans are eukaryotes and therefore possess a “true,” or membrane-bound, nucleus.

biologydictionary.net/protozoa

Protozoa Definition. 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. Although the different phyla of the kingdom Protista are not closely related, they are nonetheless classified together because of their large differences from the other kingdoms of plants, animals and fungi.

www.cdc.gov/parasites/about.html

A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.

www.differencebetween.com/difference-between-protozoa-and-vs-bacteria

Both protozoa and bacteria are microscopic, yet they exhibit very important differences between them, mainly in taxonomic diversity, body size, and other biological aspects. Protozoa. Protozoa is one of the main groups of the Kingdom: Protista, which consists of unicellular eukaryotic organisms of a diverse array.

www.ncbi.nlm.nih.gov/books/NBK8325

The Protozoa are considered to be a subkingdom of the kingdom Protista, although in the classical system they were placed in the kingdom Animalia. More than 50,000 species have been described, most of which are free-living organisms; protozoa are found in almost every possible habitat.

biologywise.com/protozoa-classification-characteristics

Protozoa are single-celled organisms without cell walls. They are believed to be a part of the microbial world as they are unicellular and microscopic. There is a great deal to know about their classification, characteristics and more.

www.scienceclarified.com/Ph-Py/Protozoa.html

Protozoa are a varied group of single-celled animal-like organisms belonging to the kingdom Protista. More than 50,000 different types of protozoa have been described. Their name comes from two Greek words, protos, or "first," and zoön, or "animal." The vast majority of protozoa are microscopic, many measuring less than 1/200 millimeter.

healthfully.com/protozoan-diseases-list-3513456.html

Protozoa are one-celled organisms that can cause diseases ranging in severity from mild to deadly. Amoebiasis is a protozoan disease caused by Entamoeba histolytica, which secretes enzymes that dissolve the host's tissues.

www.sciencedaily.com/terms/protozoa.htm

Protozoa are single-celled eukaryotes (organisms whose cells have nuclei) that commonly show characteristics usually associated with animals, most notably mobility and heterotrophy. They are often ...