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Chemical level
Smallest level, atoms act as building blocks of matter combining to form molecules
Cellular Level
Above the chemical level, molecules form in specific ways, forming organelles that are basic components of cells (cytology)
Tissue Level
Above the cellular level, groups of similar cells with common functions form tissues(histology)
Organ level
Above tissue level, made of at least 2 tissues but more typically 4, performs specific functions for the body(brain, liver, heart, etc.)
Organ system level
Above the organ level, organs that work together to achieve a common goal (cardiovascular system)
Organismal level
Above organ system, all structural levels working together
Levels of biological organization in order of size
Chemical, Cellular, Tissue, Organ, Organ System, Organismal