An elephant weighs 450000 N. The area of one of his feet is 0.5 square meter. How much pressure is exerted on the ground when it stands on the single feet?

d) physical means can be used to separate the components of air.

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.