Which dog is the cutest??

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

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

Is dna the same in every cell in the human body explain your answer