In manipulative studies, it is necessary to have an experimental group and a group.

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

If you want to double a batch of brownies you must have double the ingredients before you start cooking similarity a cell must double its contents including its dna prior to dividing

Discuss how the research in this article shows how new technology and experimental methods can lead to changes in theories.what information did you include in your answer? check all that apply.