Unicellular organisms are living organisms consisting of a single cell. They are the simplest form of life and include bacteria, archaea, protists, and some types of algae and fungi.
Unicellular organisms play vital roles in ecosystems, serving as decomposers, producers, and primary consumers.
Despite their microscopic size, unicellular organisms exhibit complex behaviors and functions necessary for survival, such as metabolism, reproduction, and response to stimuli. They can be found in various environments, from soil and water to extreme habitats like hot springs and deep-sea vents.
