instruction:
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: A sessile adult can be a filter feeder. 
Question: A sessile what can be a filter feeder?
answer:
adult.


question:
Fact: fish need to be cooled. 
Question: what needs to be cooled?
answer:
fish.


question:
Fact: Substances needed by active muscles are transported by blood. 
Question: Muscles require substances transported in the body by?
answer:

blood.