question: What sentence would provide a factual answer to this question: "What are the source of fruit?"

answer: plants are the source of fruit

question: What sentence would provide a factual answer to this question: "Why should people conserve gas when fueling their cars?"

answer: fossil fuels are a nonrenewable resource

question: What sentence would provide a factual answer to this question: "What happens when hexane's temperature goes above 70 degrees celsius?"

answer:
boiling is when liquids are heated above their boiling point