1. Multicellular Organization

2. Cooperation among cells Division of labor Systems

3. Clusters and Colonies Unicellular microorganisms Can live together, but remain individuals May act like a single organism Take on specialized roles Ex: the colonial algae Volvox

4. Volvox How does this unicellular organism help us understand the functions of cells in a multicellular organism? Certain cells in the colony play specific roles, producing offspring

5. Multicellular Organisms Need specialized structures to ensure survival. Ex: lungs, kidneys Differentiation of cells or “ specialized ” cells. Nerve cell: conducts electric signals enabling the organism to respond Gland cell: make chemicals that are secreted to different parts of the body Muscle cell: organized in a manner that allows for contratction

6. Hydra

7. Systems “ division of labor ” Cells need to work together and are coordinated and regulated Rely on each other to survive. Ex: respiratory system, circulatory system

8. Cells  Tissue  Organ  System  Organism P, N, E  atom  elements  compounds  macromolecules  organelles  cell…