Skeletal muscles are involved in: A)Propulsion of a substance through a body tube
B)Beating the heart
C)Heat Production
D)Movement of skin

The picture below shows two galaxies. spiral galaxy and elliptical galaxy which of these statements best describes a similarity between the two galaxies? (2 points) both have elongated centers. both have centers shaped like bars. both change their shape from time to time. both are held together by gravitational forces.