Groups of organs working together (e.g., the circulatory system). Organism Level: The complete, integrated living thing. 3. Classification (The Domains of Life)
Actions like bird migration or nocturnal hunting. The Organism
React to external changes in its environment. 2. The Hierarchy of Structure Organisms are organized in a "ladder" of complexity. Groups of organs working together (e
Single-celled, no nucleus (Prokaryotes). Found everywhere from soil to your gut. Groups of organs working together (e.g.