What term describes a group of single-celled organisms living together in a mutually beneficial relationship?

The term that most accurately describes a group of single-celled organisms living together in a mutually beneficial relationship is "Colony." In biology, a colony refers to a group of individuals that exist together in close proximity, often working in sync for their mutual benefit. This concept is often seen in microorganisms such as bacteria, where various species may form colonies to increase their survival chances and share resources.

In contrast, the term "Network" typically refers to a more complex interconnection that may include multiple species and is often used in contexts such as ecological interactions or communication pathways. "Aggregate" usually suggests a collection of organisms that may not necessarily function cooperatively. Lastly, "Community" refers to a broader concept encompassing various species living in the same habitat, which may include both single-celled and multicellular organisms, but does not specifically imply a mutually beneficial relationship among single-celled organisms alone. Therefore, "Colony" is the most precise term for the described scenario.