question: What sentence would provide a factual answer to this question: "Precipitation is the amount of"

answer: rainfall is the amount of rain an area receives

question: What sentence would provide a factual answer to this question: "Which is a source of raw materials?"

answer: if something is a raw material then that something comes directly from a source

question: What sentence would provide a factual answer to this question: "If plants are going to grow, their seeds need to"

answer:
plant requires seed dispersal for reproduction