What part of the process of plate tectonics do the water currents represent? what part of the process of plate tectonics do the pieces of paper represent? what was the driving force that caused the pieces of paper to move along the water’s surface?

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes