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        | The study of structure and internal workings of the body. |  | 
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        | Levels of Structural Organization |  | Definition 
 
        | Chemical Level, Cellular Level, Organ Level,and Organismal Level |  | 
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        | Simplest level (smallest components) of structual hierarchy includes atoms &  molecules |  | 
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        | Tiny building blocks of matter. |  | 
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        | A combination of 2 or more atoms of the same element. |  | 
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        | Composed of a variety of different organelles that  assemble together. Basic structural & functional unit of an organism. Same common function, vary in size & shape, each type having its own unique function. |  | 
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        | Smallest units of living things. |  | 
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        | Is a discrete structure compose of at least two (four is more common) tissue types that perform a specific function for the body. |  | 
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