question: What sentence would provide a factual answer to this question: "When a person gets hurt physically, the person feels pain because there are"

answer: nervous system is an electric conductor

question: What sentence would provide a factual answer to this question: "A ship navigates with a magnetic compass because it is"

answer: Earth 's magnetic patterns are used for finding locations by animals that migrate

question: What sentence would provide a factual answer to this question: "Humidity is the amount of what vapor in the air?"

answer:
humidity is the amount of water vapor in the air