Amoebae are single-celled organisms that belong to the group called protozoa. They are known for their unique shape, which can change as they move. Amoebae use extensions of their cell membrane, called pseudopodia, to move and capture food. They can be found in various environments, including freshwater, saltwater, and soil. These organisms reproduce asexually through a process called binary fission, where one amoeba divides into two identical cells. Amoebae play an important role in ecosystems by breaking down organic material and serving as food for larger organisms, such as protozoan predators and small invertebrates.