1. Levels of Organization of Life
Invitation to Biology
Levels of Organization of Life

2. Life’s Levels of Organization
Nature has levels of organization
Unique properties emerge at successively higher levels

3. Organization Within An Organism
Atoms are organized into molecules
In multicelled species, cells are organized into tissues, organs, and organ systems
All organisms consist of one or more cells
Emergent properties: Life emerges at the cellular level

4. Organization of Groups of Organisms
Population
All individuals of one species in a specific area
Community
All populations in a specific area
Ecosystem
A community interacting with its environment

5. Organization of Life on Earth
Biosphere
All regions of Earth that hold life
Land, water, and atmosphere

6. Levels of Organization

7. Levels of Organization

8. molecule
cell
tissue
organ
organ system
atom
Fig. 1.3a, p. 4

9. multicelled organism population community ecosystem biosphere
Fig. 1.3b, p. 4