ameba

An amoeba is a tiny, single-celled organism that lives in water or moist environments. It has no fixed shape, instead changing form as it moves and engulfs food using extensions called pseudopodia—temporary bulges of its cytoplasm. Amoebas are capable of basic functions like eating, growing, and reproducing through a process called binary fission, where one cell splits into two. They play a role in ecosystems by breaking down organic material. Some amoebas can cause infections in humans, but most are harmless and essential parts of natural microbial communities.