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.

Ex Input:
Fact: Energy enters ecosystems from the sun. 
Question: The sun contributes what to ecosystems?

Ex Output:
energy.


Ex Input:
Fact: nails prevent water loss. 
Question: what do nails prevent?

Ex Output:
water loss.


Ex Input:
Fact: The digestive system provides the regeneration of cells for the body. 
Question: What provides the regeneration of cells for the body?

Ex Output:

the digestive system.