In this task, you are given a question and a corresponding answer. Your task is to generate a fact statement that is useful in answering the given question.

[EX Q]: Question: Metamorphosis is complete at? Answer: adulthood.
[EX A]: a moth undergoes metamorphosis

[EX Q]: Question: A ball rolling over carpet will go ______ than a ball rolling over concrete.? Answer: slower.
[EX A]: as the roughness of something increases , the friction of that something will increase when its surface moves against another surface

[EX Q]: Question: A shrew requires this for survival.? Answer: air.
[EX A]:
an animal requires air for survival