In a factory there are many times that need to be performed someone has to order in stock supplies that are needed for the factory others we use the supplies to manufacture certain parts of the product someone else may have to put together all the pieces then the product has to be inspected and package for sale do you human body works in much the same way there are many times that need to be performed in the human body specialized cells have developed to perform all the little task that the human body needs to operate as a whole what is the main reason that multi celled organisms such as humans have developed specialized cells?