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

Fact: roots have different meristems. 
Question: What do roots have?
meristems.

Fact: plates in the earth collide which causes earthquakes. 
Question: plates in the earth do what which causes earthquakes?

collide.