Organism

An organism is any individual living thing, such as a plant, animal, fungus, or microorganism. It has a unified structure and performs vital functions like growth, reproduction, and response to its environment. Organisms are made up of cells, which are the basic building blocks of life. They can vary greatly in size and complexity—from microscopic bacteria to large elephants. Essentially, an organism is a complete, functioning life entity capable of maintaining itself and interacting with its surroundings within an ecosystem.