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.

Example Input: Fact: human power causes a bike to move. 
Question: What causes a bike to move?
Example Output: Human power.

Example Input: Fact: The more carbon dioxide a plant receives, the more likely it is to suffer water loss. 
Question: The more carbon dioxide a plant receives, the more likely it will suffer what?
Example Output: water loss.

Example Input: Fact: a cavern is formed by carbon dioxide is in groundwater seeping through rock and dissolving limestone. 
Question: What forms caverns by seeping through rock and dissolving limestone?
Example Output:
carbon dioxide in groundwater.