Expiration occurs when the lungs recoil.
Answer:
An event can cause changes to occur in one or more of the spheres, and/or an event can be the effect of changes in one or more of Earth's four spheres. This two-way cause and effect relationship between an event and a sphere is called an interaction. Interactions also occur among the spheres.
Because with that the mitochondria will make ATP (energy) for the cell and your body
I just learned that today XD
