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.

[Q]: Fact: A fertilized egg can create an offspring if it's carried until birth. 
Question: When does a fertilized egg become an offspring?
[A]: When it's born.


[Q]: Fact: conserving water can be used for survival in a desert. 
Question: Where is conserving water useful for survival?
[A]: desert.


[Q]: Fact: ink is used for hiding from eels by some creatures. 
Question: What do some creatures use to hide from eels?
[A]:
ink.