As a child, alex was short for his age. but during his teenage years, his height increased and he surpassed most of his friends. what must have occurred to create this growth spurt?

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