Human Anatomy & Physiology (11th Edition) Edit edition

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All the living organisms are made up of cells. The cell theory is proposed by the Schleiden and Schwann. According to the cell theory, cell is the basic structural and functional unit of life. The cell was first discovered and named by the Robert Hook in 1665.

In unicellular organisms, single cell performs all the functions, while in multicellular organisms the body shows level of organization. The five levels of organization are observed in the multicellular organisms.

The cell is made up of water and mixture of molecules like carbohydrates, proteins, and lipids. Thus, all these chemical molecules are combined to from a cell. The cells are further organized basing on the type of function performed.

The various level of organization of an organism is as follows:

Hence, the correct answer is option (c).