A long spanner is convenient to open a tight nut than shorter one ans: because we require less amount of force to open nut and makes the nut be easily rotate​

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.