. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "A Complex with a particular Function is formed out of Component_entities. The function may be expressed by reference to a Salient_entity involved in the working of the Complex.\nThe body's immune system can be mobilized against cancer. \nThe sewer system carries wastewater from homes and businesses to the Water Pollution Control Plant for treatment. \n"^^ . . . . . . . . . . . . . . . . . . . . . .