The answers that I selected were wrong so I’m confused. What are the answers

Describe how an electric generator works

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

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