Air is made up of several gases, but the two most important gases are Oxygen and Carbon dioxide. Without oxygen, animals will die, and without carbon dioxide, plants cannot survive<span>. Food (nutrients): Living things need energy for function. Energy is needed to grow, reproduce, move, and to work.</span>
Cellular respiration is the process of the cells inside the body breaking up the sugars and then the mitochodria turns it into energy for the cells. ... Inside the otter diffusion happens throughout the lungs.