To test for side effects and rare effects (the bigger the sample size, the more likely that wired things may occur)
It is colder at the top of a mountain because there is less air pressure. The same amount of heat is now in a larger area so it is more spread out.
<span>The nervous system interacts with every other system in the human body. While the respiratory system regulates the intake and exhale of air, the nervous system then controls the rate of breathing on behalf of the body.</span>