Which group of organisms includes microorganisms such as yeasts, molds, and mildews?

The group of organisms that includes yeasts, molds, and mildews is classified as fungi. Fungi are a distinct kingdom of life characterized by their ability to absorb nutrients from organic materials, often decomposing and breaking down matter in the environment. They can exist in single-celled forms, like yeasts, or as multicellular structures, like molds and mushrooms.

Yeasts are often used in baking and brewing due to their fermentation abilities, while molds and mildews can be found in various environments, including on food and in damp areas. Fungi play essential roles in ecosystems, including nutrient cycling and forming symbiotic relationships with plants.

In contrast, the other groups mentioned have distinct characteristics that exclude them from this classification. Bacteria are single-celled organisms that have a different cellular structure and metabolic processes, while viruses are much smaller entities that require a host to replicate. Protozoa are also single-celled but belong to a completely different category that primarily consists of animal-like organisms, distinguishing them from the features of fungi.