Explain why there is not only correct scientific process

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

Environmental impacts on evolution : mastery test

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