Protists are difficult to characterize because of the great diversity of the kingdom. These organisms vary in body form, nutrition, and reproduction. They may be unicellular, colonial, or multicellular.
It is hard to demonstrate one certain way a protist reproduces :
Some protists use agamic reproduction at one stage in their life and then use gamic reproduction at another stage in their life.
Thus, Protists are difficult to characterize because of the great diversity of the kingdom.
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