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: Amphibians have a larynx to make sounds. 
Question: What do amphibians use to make sounds?
answer:
Voice box.


question:
Fact: passive immunity lasts only as long as the antibodies survive in blood. 
Question: passive immunity lasts only as long as the antibodies survive where?
answer:
blood.


question:
Fact: A mutation in the sex cells of the mother or father can cause  new trait to appear in their offspring. 
Question: A mutation can cause a new trait to appear in?
answer:

mother or father's sex cells.