The answer should 112^4, or your fourth choice.
Newton's laws of motion relate an object's motion to the forces acting on it. In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration
Walking and even petting dogs appears to be associated with reduced risk of (A)<span> blood pressure and heart rate. Having a walk regularly will help you have a normal blood circulation. It will regulate the pumping of your blood from your heart in a normal way. It will also help you to lose weight and make you healthier.</span>
Muscles are also necessary for movement: They're the masses of tough, elastic tissue that pull our bones when we move. Together, our bones, muscles, and joints — along with tendons, ligaments, and cartilage — form our musculoskeletal system and enable us to do everyday physical activities.
