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: What will, for all intents and purposes, never run out? Answer: sunlight.
a renewable resource can be replaced

Question: A  cast iron stove uses what as fuel? Answer: timber.
a stove generates heat for cooking usually

Question: What are nutrients a source of energy for? Answer: whales.

nutrients are a source of energy for living things