C. What does it tell you when the water is green?

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 is the importance of keystone species

Alarge body of air that has similar temperature, humidity and air pressure at a given height is called a