How are ferns and trees alike and different and what would survive longer without rain fern or tree?

Which of the four major uses is predicted to change the least by 2020?

Types of scientific inquiry that biologist engage in that cannot be completely controlled

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