Amoebas are single-celled organisms that belong to the group called protozoa. They are found in various environments, including freshwater, saltwater, and soil. Amoebas move and feed by extending their cell membrane to form temporary structures called pseudopodia, which allow them to engulf food particles. These organisms reproduce asexually through a process called binary fission, where one amoeba divides into two identical cells. Amoebas play an essential role in their ecosystems by breaking down organic material and serving as food for larger organisms, contributing to the balance of aquatic and terrestrial environments.