The Organism May 2026

Scientists categorize every organism into three primary domains:

An organism is any individual living system, such as an animal, plant, fungus, or bacterium. To be considered "alive," an organism generally must: The Organism

Groups of similar cells working together (e.g., muscle tissue). such as an animal

React to external changes in its environment. 2. The Hierarchy of Structure Organisms are organized in a "ladder" of complexity. or bacterium. To be considered "alive

Regulate its internal environment (like temperature or pH).