question: What sentence would provide a factual answer to this question: "An animals brain controls what?"

answer: an animal 's brain controls that animal

question: What sentence would provide a factual answer to this question: "Which relationship is most true?"

answer: hawks eat lizards

question: What sentence would provide a factual answer to this question: "the mass of a planet causes"

answer:
the mass of a planet causes the pull of gravity on that planet