Mycology is the study of fungus, including their genetic and biochemical features, classification, and use by humans as a source of tinder, traditional medicine, food, and entheogens, as well as their risks, such as toxicity and infection. A mycologist is a scientist who specializes in fungus. Mycology overlaps with phytopathology, the study of plant diseases, and the two fields are inextricably linked because fungus make up the great majority of plant infections.
Phycology, sometimes known as algology in some circles, is the study of algae, which are part of the plant kingdom. Algae serve a significant role as primary photosynthetic plants in freshwater as well as a source of food for diverse creatures in aquatic environments, despite the fact that they lack the stems, roots, and leaves found on terrestrial plants. Algae play an important role in aquatic ecosystems as primary producers. Algae are photosynthetic eukaryotic creatures that thrive in a moist environment. They differ from higher plants in that they lack true roots, stems, and leaves. They don't bloom. Many species are single-celled and microscopic, while others are multicellular to some extent, with some reaching great heights.
The study of protozoa, or "animal-like" (i.e. motile and heterotrophic) protists, is known as protozoology. The Protozoa are regarded as a Protista subkingdom. They are free-living organisms that can be found in almost any environment. Protozoa can be present on the bodies of all humans, and many people may be infected with one or more throughout their lives.