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Even though the fundamental unit of any multicellular organism is the cell, even cells are composed of smaller subunits! An example of this would be: a Golgi body within a cell, the proteins which compose it, the proteins chemical backbone, and then finally down to the protons and electrons which make up chemicals!

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A hierarchical analysis of systems was first thought of in the 1950's. This later gave rise to the concept of "hierarchical ecology."

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These levels can also extend further than the organism level! After an organism you have communities, populations, ecosystems, and the biosphere!

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When it comes down to it, you and I are just one unit in a higher level of classification: an organism. If you were to take away any other level lower (e.g. tissues) the rest of the levels would fail to function.

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Some living things contain one cell that performs all needed functions. These are called "unicellular organisms." Multicellular organisms are made of many parts that are needed for survival. These parts are divided into levels of organization. There are five levels: cells, tissue, organs, organ systems, and organisms.

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Each block of organization is composed of the fundamental units of the previous level.

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HS-LS1-2 Develop and use a model to illustrate the hierarchical organization of interacting systems thatprovide specific functions within multi-cellular organisms. 

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HS-LS1-2 Develop and use a model to illustrate the hierarchical organization of interacting systems thatprovide specific functions within multi-cellular organisms. 