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: Humans have collected and grown fungi for food for thousands of years. 
Question: What have humans collected and grown as food for thousands of years?
fungi.

Fact: the process of isolating and making copies of a gene is now routine. 
Question: the process of isolating and making copies of a gene is now what?
routine.

Fact: Something made of keratin prevents injury by forming protective plates. 
Question: Something that prevents injury by forming protective plates is made of what?

Keratin.