Here's a problem to solve: Animals are made up of many atoms. What happens to the atoms after an animal has died?

Among the 4 following options, which is the correct answer?

- A: The atoms stop moving.
 
- B: The atoms recycle back into the environment.
 
- C: The atoms split into simpler parts and then combine to form other atoms.
 
- D: The atoms no longer exist once the animal has decomposed.
 