The Organism ★ Free Access

Scientists categorize every organism into three primary domains:

Heterotrophs (must eat other organisms for energy). 4. Survival Mechanisms The Organism

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

Scientists categorize every organism into three primary domains:

Heterotrophs (must eat other organisms for energy). 4. Survival Mechanisms

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