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How do adaptation affect a species?

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

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.