Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.
--------
Question: Fact: Playing is one of many ways animal improve ability to survive and thrive. 
Question: Playing is one of many ways animal improve ability to what?

Answer: survive.


Question: Fact: Aging is associated with apoptosis. 
Question: What stage is associated with apoptosis?

Answer: aging.


Question: Fact: an automobile uses energy stored in molecules to make mechanical energy. 
Question: Where is energy stored before being used by an automobile to create mechanical energy?

Answer:
In molecules.