You are doing a clinical on the medical-surgical floor of a local hospital when mr. b arrives from the emergency room. mr. b is a 32-year-old who was thrown off his bicycle in an accident; he has three fractured ribs and a punctured lung. in the er, they inserted a chest tube to drain air and fluid out of his pleural cavity, allowing his lungs to re-expand. he had one dose of demerol 3 hours ago for pain and a second dose just before transfer, according to the telephone report from the er nurse.

20 points “the creation of a mosaic was a complicated procedure that called for careful timing and teamwork. . walls were painted with resin or tar before being covered with the first of three layers of plaster. . a sketch of the projected work was then made on the plaster to serve as a guide for the various artisans. the outermost layer of plaster, in which the pieces, or tesserae, of the mosaic would be set, was spread on only enough area to contain a day’s work. some of the tesserae—small, carefully cut fragments of colored glass, marble, and semiprecious stones—were pressed into the wet plaster so that they projected at a slight angle. the stones thereby better reflected light and imbued the finished mosaic with a shimmering life of its own.” —empires besieged: time frame a. d. 200–600 how many layers of materials were under the tiles? a. two- c. four- b. three- d. five