Functional explanation: A Debate z The features offunctional explanation y This type ofexplanation is most commonly used in biology. It takes the form of indicating one or more functions(or even dysfunctions)that a unit performs in maintaining or realizing certain traits of the system to which the unit belongs. "(Nagel, 1979, P. 23) For example, in explaining why human being has lung, the typical explanation in biology is that lung performs the function of breathing, i.e. provide oxygen to the f the proper maintenance of the system of a human body y The structure offunctional explanation: Accordingly functional explanation consist of the followings x Xperformthe function of y to the systemofz x y therefore explains the existence ofX or Z's possession ofy.Functional explanation: A Debate z The features of functional explanation: y This type of explanation is most commonly used in biology. It "takes the form of indicating one or more functions (or even dysfunctions) that a unit performs in maintaining or realizing certain traits of the system to which the unit belongs." (Nagel, 1979, p. 23) For example, in explaining why human being has lung, the typical explanation in biology is that lung performs the function of breathing, i.e. provide oxygen to the of the proper maintenance of the system of a human body. y The structure of functional explanation: Accordingly functional explanation consist of the followings x X perform the function of Y to the system of Z x Y therefore explains the existence of X or Z's possession of Y