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.

Fact: ears made of cartilage. 
Question: What are ears made of?
cartilage.

Fact: nerve receptors in the skin sense temperature and pain. 
Question: what in the skin sense temperature and pain?
nerve receptors.

Fact: Hand lenses or magnifying glasses are used to see small things to make them appear bigger. 
Question: What or or magnifying glasses are used to see small things to make them appear bigger?

hand lenses.