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: diatomes have varied life cycles. 
Question: what have varied life cycles?
answer:
diatomes.


question:
Fact: All birds have backbones. 
Question: Which animal has a backbone?
answer:
bird.


question:
Fact: Growth usually ceases when humans become sexually mature. 
Question: _ usually ends when humans become sexually mature.?
answer:

Growth.