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: Mutations can be detected by analysis on gene abnormalities. 
Question: Which process of gene abnormalities can mutations be detected?
answer:
analysis.


question:
Fact: mountain barriers can influence local weather changes. 
Question: what can mountain barriers influence?
answer:
local weather.


question:
Fact: Viruses often can spread bacteria through droppings. 
Question: Viruses often can spread bacteria through what?
answer:

droppings.