¿Qué son los cambios de estado?, ¿Qué debe suceder con un cuerpo para que ocurran?

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

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.

i think the answer is tomato juice? not entirely sure though