Two airplanes leave an airport at the same time. The velocity of the first airplane is
680 m/h at a heading of 57.7◦. The velocity
of the second is 580 m/h at a heading of 119◦. How far apart are they after 2.4 h? Answer in units of m.

measure their densities same density, same sub

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.

3. dark matter

empty space could also be a simple vacuum