Catabolism (a form of metabolism in which cells are breaking down larger units into smaller units).
Another answer is cellular respiration
Hydrogen fuel cell powered cars emit a 0 emission.
In firing a handgun, it is best to have protection in the eyes and ears. It could be seen to those people who are practicing shooting and to those who are authorize to use a hand gun. The reason why these are needed to be protected because firing a hand gun is loud enough that it could damage the ears when not protected and in the same time if eyes is not protected and the hand gun could have any complication or dysfunction, it could affect the eyes.
