Jack found a fossil in a rock that he dug up. The fossil is of a fish. Which can the fossil tell him about the land when the fish was alive?

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