Final answer:
The function of an organ system is to work together with various organs to perform specific, complex tasks required for maintaining the health and functionality of an organism.
Step-by-step explanation:
The function of an organ system is B. To work together to do a specific job. An organ system is composed of a group of organs that collaborate to perform a complex overall function within a living organism. For instance, the circulatory system includes organs like the heart and blood vessels which work together to transport blood throughout the body. Each organ system contributes to the organism's ability to maintain life and health by performing its unique function.
Cells form tissues, tissues join to create organs, and organs combine to establish organ systems. Organ systems do not operate singly; they interact with other systems to ensure that essential tasks, such as supplying oxygen and nutrients to cells and removing waste products like carbon dioxide, are efficiently carried out. Hence, the organ systems of the body must all function in harmony.