Which statement explains how gravity and inertia work together?

They change the motion of objects.
They take turns working on objects.
They keep all objects moving at the same speed.
They prevent objects from moving in a circular motion.

Jenny places a strip of ph paper into a solution. when she removes the ph paper, it has turned yellow-green. what should jenny do next to determine the ph of her solution? a. use a different testing method because the ph paper should not change colors b. place the ph paper into a machine that reads the ph of the solution c. compare the ph paper's color with the color of ph paper from another solution d. compare the ph paper's color with a chart of colors and ph ranges