question: What sentence would provide a factual answer to this question: "A cactus stem is used to store what?"

answer: a cactus stem is used for storing water

question: What sentence would provide a factual answer to this question: "If the earth were small enough to put on a plate and serve up for dinner, the being eating it would get mouthfuls of"

answer: Earth 's surface is made of rock

question: What sentence would provide a factual answer to this question: "Where would jumping be the hardest?"

answer:
as mass of a celestial body increases , the force of gravity on that planet will increase