question: What sentence would provide a factual answer to this question: "To survive living things"

answer: living things require water for survival


question: What sentence would provide a factual answer to this question: "A rainbow is caused by rain and what?"

answer: sunlight and rain can cause a rainbow


question: What sentence would provide a factual answer to this question: "An example of a mixture is"

answer:
An example of a mixture is clay mixed together