Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Living Organisms (hierarchy name)
4. living organisms (entities)
5. Eukaryota (domain)

Anotations

Scope note:

General term for many types of microscopic organisms that were formerly thought to be a related group, but are today believed to instead represent organisms that do not necessarily share a common evolutionary history. They have in common that they are single-celled and heterotrophic eukaryotes, have a membrane-bound nucleus, are nonfilamentous, and are confined to moist or aquatic habitats, ubiquitous worldwide. Many are symbionts of other organisms, and some species are parasites.