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Levels of Cell Organization ● The levels of organization of a cell, tissue, organ, organ system and organism. Levels of Cell Organization Level 1: Cells Are the basic unit of structure in living things Smallest organism that can function independently Levels of Cell Organization Level 2: Tissues A group of cells that work together to perform the same function. Levels of Cell Organization Level 3: Organs Made up of tissues that work together to perform a specific activity Levels of Cell Organization Level 4: Organ Systems Groups of organs that work together to perform a specific function for the organism. Levels of Cell Organization Level 5: Organisms Entire living things that can carry out all basic life processes 1. 5. 2. 3. 4.