All the terrestrial planets have a. liquid oceans b. liquid helium c. rock surfaces d. at least one moon i think it's c or d, but i don't know..

it has to be b, about 97 percent.

mass and volume are the answers you are looking for

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.