3things your body does everyday which require energy

Explanation:

The body needs energy for everything it does: breathing, eating, sleeping, walking, working and any other activity that we perform in our everyday lives. This energy is provided by food in the form of calories. The body uses energy to eat, digest and metabolize food, and to burn kilojoules during physical activity, but it also needs a large amount of energy to exist in a state of complete rest.

i am going to guess that it is co2.