Compare the ke of an 80 kg person walking at 4 m/s with that of the same person moving at 6 m/s. ke at 4 m/s = ke at 6 m/s ke at 4 m/s less than ke at 6 m/s the answer cannot be determined ke at 4 m/s greater than ke at 6 m/s

they are non-matter

explanation:

they are non-matter. basically, any type of energy or any abstract concept is an example of something that does not matter. other examples include dreams, magnetism, radio, and hate

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.