question: What sentence would provide a factual answer to this question: "Thick feathers can be used for"

answer: thick feathers can be used for keeping warm

question: What sentence would provide a factual answer to this question: "If you scrape an object, small pieces or particles may break off of the object; what's an example of this?"

answer: scraping an object may cause small particles to break off of that object

question: What sentence would provide a factual answer to this question: "A person wanting to signal with light could redirect sunlight with"

answer:
a mirror reflects light