question: What sentence would provide a factual answer to this question: "If you wanted to make a metal bed frame, where would you start?"

answer: alloys are made of two or more metals

question: What sentence would provide a factual answer to this question: "As a sled runs off the snow and on to the asphalt it's runners start"

answer: as the roughness of something increases , the friction of that something will increase when its surface moves against another surface

question: What sentence would provide a factual answer to this question: "If a bird is avoiding detection by a cat simply by sitting still, it probably is also utilizing"

answer:
camouflage is used for hiding by animals against predators