Organism — The

React to external changes in its environment. 2. The Hierarchy of Structure Organisms are organized in a "ladder" of complexity.

Regulate its internal environment (like temperature or pH). The Organism

Heterotrophs (must eat other organisms for energy). 4. Survival Mechanisms React to external changes in its environment

Convert chemicals and energy into cellular components. Grow and Develop: Increase in size or complexity over time. The Organism

Every organism is a product of . They possess Adaptations —inherited traits that increase their chances of survival.