Levels of Organization of Life Invitation to Biology Levels of Organization of Life

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

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

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

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

Levels of Organization

Levels of Organization

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

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