Life’s Levels of OrganizationThe world of life shows levels of organization, from the simple to the complex, which extend through: cells (made of?) tissues & organs organisms populations communities ecosystems the biosphere
Reductionist Principle The study of life is complex so • Chemicals broken down into compartments • Cells Within a cell • Tissues Among cells in an organ • Organs Among the organ systems in an • Systems organism • Organism Between organisms and the • Population environment • Community Among individuals in a • Ecosystem population Between species
The Cell, Structure & FunctionWhat is a cell ?(The cell is the Structural and functional unit of all livingorganisms)Two Types of cells:1- Prokaryotic cells: cells without a nuclear membraneThe DNA is free in the cytoplasm: Bacteria and Cyanobacteria2- Eukaryotic cells: has a proper nucleus with a nuclearmembrane: plants, animals ….
What does this figure describe? What else “flows” from producers toconsumers to decomposers?
I. Characteristics of Living OrganismsA. Living things share the following characteristics: 1. Living things are made up of units called cells. a. Remember that cells are like little packages f chemical reactions. b. Life processes only occur as a result of chemical reactions in cells (life is chemistry) 2. Living things reproduce. 3. Living things are based on a universal genetic code. (Contain DNA)
4. Living things grow and develop.5. Living things obtain and use materials and energy. (Eat or Photosynthesize)6. Living things respond to their environment.7. Living things maintain a stable internal environment. (Maintain Homeostasis) a. Homeo=Same Stasis= Status8. Taken as a group, living things change over time. (Evolve)