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: An item's weight causes its gravitational force. 
Question: The weight of an item causes its what?
Example Output: gravitational weight.

Example Input: Fact: Disease-causing tiny living cells have a negative impact on the body. 
Question: What can cause disease, and have a negative impact on the body?
Example Output: Tiny living cells.

Example Input: Fact: After lancelet eggs are fertilized, they develop so that they can navigate in the water themselves. 
Question: What needs to happen so that lancelet eggs can navigate in the water themselves?
Example Output:
fertilization.