question: What sentence would provide a factual answer to this question: "Berries"

answer: a berry contains seeds

question: What sentence would provide a factual answer to this question: "Which would mandate replacing natural resources?"

answer: An example of replacing a natural resource is planting new trees where a forest once stood

question: What sentence would provide a factual answer to this question: "What would be a source of the smoothest rocks?"

answer:
contact between rocks over long periods of time causes rocks to smooth