Choose the answer that best completes this sentence: the moon may have contributed to the evolution of life from
its gravitational pull
sea to land
keeping earth spinning on its axis
its impact into earth

powerful computers now, not then

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.