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19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

When analyzing tree rings, what do scientists assume a thin ring indicates?

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