Which of the following is not a main function of the muscular system? A.
To attach to bones and help the body move
B. O To protect the body's internal organs
С.
To control the flow of blood into and out of the heart
D.
To produce mucus to lubricate the body's joints


Why is it important for scientists to review and repeat the work of other scientists? 1.a scientific theory must be tested three times before it is proven. 2.the scientific method only applies to repeated experiments. 3.an experiment may have had errors that the scientists didn't recognize. 4.the results of individual scientists may be influenced by bias. 5.an experiment must be performed twice before the data can be analyzed.