Gravity can be described as a. the force that moves electric charges b. the force of attraction between two objects c. the force that repels objects with like charges d. an magnet force found in nature

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.