How do animals survive at lower depths in the ocean? Why would they need to change their buoyancy? Give an example of a marine animal that would need this adaptation and explain why it would be beneficial to have this adaptation.

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