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Levels of Structural Organization
1) Chemical level- atoms form molecules such as water and proteins. Molecules then form organelles which compose cells
2) Cellular level- cells are the smallest units of living things. All cells have common functions but vary in size and shape to reflect their unique function
3) Tissue level- groups of similar cells that have common functions. Four basic types of tissue in the human are epithelium, muscle, connective tissue and nervous tissue.
4) Organ level- an organ is a structure compose of two of more types of tissue. On this level extremely complex functions become possible.
5) Organ system- organs that work together to achieve a common purpose
6) Organismal level- the sum total of all structural levels working together to promote life
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