Facilitated diffusion requires movement through a

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

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