The most heterogeneous kingdom in terms of morphology is Protista. It is composed of unicellular organisms.
Protista is a kingdom composed of different types of single-celled (unicellular) microorganisms.
This kingdom (Protista) consists of animal-like (motile) microorganisms and plant-like (nonmotile) microorganisms.
Animal-like protists are known as protozoa, whereas plant-like protists are known as algae.
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