10 hilariously insightful foreign words. Protists is a catch-all term used to describe all eukaryotic organisms — meaning those that have cells with nuclei — besides animals, plants, and fungi. Examples include the unicellular animal-like protozoa, the fungus-like slime molds, and the plant-like protophyta.reen algae resemble members of the plant kingdom in that they use the same forms of chlorophyll. They are, in fact, thought to be the ancestors of green plants. They vary from single celled to multicellular types, and can be found in a variety of aquatic or moist environments.