What signs unite organisms in the sub-kingdom of protozoa?

Protozoa are unicellular eukaryotes (organisms whose cells have nuclei), which usually exhibit characteristics associated with animals, primarily motility and heterotrophy.

Most protozoa are too small to be seen with the naked eye – most are around 0.01-0.05 mm, although shapes up to 0.5 mm are still fairly common but can be easily seen under a microscope.

They are not animals, but belong to a separate Sub-Kingdom of the Protozoa.



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