When flying from warmer than standard air towards colder than standard air, with the aircraft’s pressure altimeter indicating a constant altitude, is the aircraft’s ACTUAL altitude changing? If so, is it gaining or losing altitude? Explain your answer. (Assume no corrections are made to the altimeter during the flight.)

probably not if net force is zero

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.