An organization of several different kinds of tissues so arranged that together they can perform a special function.

• A. Organ
• B. Tissue
• C. Cell
• D. Organ System

Answer: (A)

An organ is a structure formed by several different tissues organized to perform a specific function. Tissues are groups of similar cells carrying out a common task, but they don’t work alone to accomplish complex jobs. A cell is the basic unit of life, the smallest unit that carries out life processes. An organ system is a higher level, made up of multiple organs coordinating to handle broader physiological tasks.

So the description of a structure composed of different tissues that together perform a special function matches an organ, since it is the level at which diverse tissues combine to carry out a distinct function (like the stomach, which uses muscle, connective, and epithelial tissues to digest food).