Reasoning, a more direct approach to research, rejects the use of the work “all” because one counterexample can disprove the theory.

newton's first law of motion

d) physical means can be used to separate the components of air.

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.