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 Q]: Fact: nerve receptors in the skin sense temperature and pain. 
Question: what in the skin sense temperature and pain?
[EX A]: nerve receptors.

[EX Q]: Fact: Some mollusks are not easily seen with the naked eye. 
Question: What are not easily seen with the naked eye?
[EX A]: mollusks.

[EX Q]: Fact: Plastics are made from fossil fuels. 
Question: What is made from fossil fuels?
[EX A]:
plastic.