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.
--------
Question: Question: Where would rocks be the smoothest? Answer: where water has flowed for years.

Answer: contact between rocks over long periods of time causes rocks to smooth


Question: Question: With a ruler I can measure? Answer: a phone.

Answer: a ruler is used for measuring the length of an object


Question: Question: Which of the following requires water to live? Answer: birds.

Answer:
living things require water for survival