Which of the following features of molecule or ion movement is an essential characteristic of simple diffusion? (choose all that apply) a. through a membrane b. using a transport protein c. the molecules moving are only water molecules d. uses added energy

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