question: What sentence would provide a factual answer to this question: "What is an example of predators eating prey?"

answer: predators eat prey

question: What sentence would provide a factual answer to this question: "It is easiest to get a clear photo of the moon by"

answer: as the size of an object appears larger , that object will be observed better

question: What sentence would provide a factual answer to this question: "To measure the length of a elephant's trunk you would need"

answer:
a meter stick is used to measure length