What is an action excerted on a body in order to change the body's state of rest or motion?​

prolly a beacuse the momentuem the car has increases while going down hill

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.