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1. Chemical level: Atoms > molecules > organelles
2. Cellular level: Cells- Smallest unit, vary in size and shape
3. Tissue level: 4 basic tissues: epithelium, muscle, connective and nervous
4. Organ level: performs a specific function in the body with 2-4 tissue types
5. Organ system: organs working together to make a system
Ex. Heart & blood vessels of the cardiovascular system
6. Organismal level: all structural levels working together to give life
Levels of Structural Organization