How long does it take adrian to reach his destination if his displacement is 253 meters and he walks north with a velocity of 1.6 m/s ?

i think the answer is a, hope this : )

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.