If a better model is found, that will become a theory instead.
Energy cannot be created or destroyed; it can only change from one form to another. There is always as much energy after an event as there was before, but some of the energy may be wasted as heat that escapes into the surroundings.
The Medulla Oblongota is what determines your breathing rate :)
Medulla Oblongata is your answer :)
Good luck!
Answer:
They eat =-= they eat food. Example: A deer eats grass, wolf eats deer, wolf dies, beedles eat wolf, ect.