Proteins play an important role in maintaining all these things, proteins are necessary for the development and repair of bones or muscles,skin and blood.<span />
If they can learn more about how the human body ages,why some people live longer than others then perhaps they could apply these different facts in order to eventually discover our lifespan.
They need to find a ride home, they need to think about the safety of themselves and others around them!
the vehicle that is already in the lane