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: Beavers cause ponds and lakes to form. 
Question: What can be the cause of lakes and ponds forming?
answer:
beavers.


question:
Fact: Some viruses can cause abnormal cell growth. 
Question: What be caused by some viruses?
answer:
Abnormal cell growth.


question:
Fact: mosses depend on moisture to reproduce. 
Question: Mosses depend on what to reproduce?
answer:

moisture.