2. How do car manufacturers determine if safety features can overcome the net force acting on a passenger in a potential car crash?

the first step is making objective observations.

they have to be based on a certain event and can be confirmed by others if it is right or not.

show the wavelengths of a wave. show the crests of a wave.

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.