A weight lifter lifts a set of 212 kg weights to a height of 1.75 m. How much
potential energy to the weights now have?

i think the answer would be b

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.