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: navigation requires knowing which way to go. 
Question: What requires knowing which way to go?
Example Output: navigation.

Example Input: Fact: marine and benthic creatures lack respiratory and excretory systems. 
Question: what creatures lack respiratory and excretory systems?
Example Output: marine and benthic.

Example Input: Fact: Most organisms live mainly in shallow coastal waters. 
Question: Most organisms live mainly in?
Example Output:
shallow coastal waters.