Protozoans

Protozoans ("first animals") may resemble the single-celled, heterotrophic protistans that gave rise to animals. All are predators or parasites. Asexual reproduction by fission or budding dominates protozoan life cycles, but some can reproduce sexually. Many parasitic types form resistant cysts. A few protozoans are famous for the diseases they cause in humans.

The major groups of protozoans are:

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